Microscope optics pdf download

Microscope optics pdf download

Optical Systems for the Microscope,Introduction to Optical Microscopy by Jerome Mertz Book PDF Summary

Optical Systems for the Microscope - PDF Free Download Optical Systems for the Microscope Home Optical Systems for the Microscope General remarks Planapochromats The Olympus Microscope Screen Saver offers views of the latest Download our latest review article on optical microscopy and in PDF format. Compound binocular light microscopes 01/12/ · Download full-text PDF. Read full-text. Download citation. Copy link Link copied. strikes a specimen, and enters an optical microscope. (As shown in US Patent #6,, OPTICAL MICROSCOPYDavidson and Abramowitz 5 the classic Rayleigh equation often cited for resolution (2, ): d = (l / 2NA) (1) Where d is the space between two adjacent Microscope Maintenance blogger.com - Free download as PDF File .pdf), Text File .txt) or read online for free. Scribd is the world's largest social reading and publishing site. Optical ... read more

This book presents a comprehensive and coherent summary of techniques for enhancing the resolution and image contrast provided by far-field optical microscopes. It takes a critical look at the body of knowledge that comprises optical microscopy, compares and contrasts the various instruments, provides a clear discussion of the physical principles. The Evolution of the Microscope covers some of the features of the history of the microscope and the rationale of the design features found in microscopes. The book discusses the first microscopes, the compound microscope in England , simple or single-lens microscopes, and the development of the achromatic microscope.

Knowledge of microscope design is rapidly becoming more important. Microscopes are used in critical applications such as drug development, clinical tests, and genomics. Considerable expertise is required for the evaluation, design, and manufacture of these instruments. Several subsystems must be integrated: the source, the illumination optics, the specimen, the objective. Introduction to Optical Microscopy Download Introduction to Optical Microscopy full book in PDF, ePub and kindle written by Jerome Mertz and published by Cambridge University Press which was released on 31 July with total hardcover pages Home The Optical Microscope. Introduction to Optical Microscopy. Introduction to Optical Microscopy by Jerome Mertz.

A Practical Guide to Optical Microscopy by John Girkin. Fundamentals of Light Microscopy and Electronic Imaging by Douglas B. Murphy,Michael W. Confocal Scanning Optical Microscopy and Related Imaging Systems by Gordon S. Kino,Timothy R. Optical Microscopy of Materials by Raymond Haynes. Understanding Light Microscopy by Jeremy Sanderson. Optical Imaging and Microscopy by Peter Török,Fu-Jen Kao. Start by pressing the button below! Home Add Document Sign In Register. Optical Systems for the Microscope Home Optical Systems for the Microscope. General remarks Planapochromats Phase-contrast obiectives A few wordson the workingprinciple of the microscope P O L Author: Carl Zeiss Oberkochen. DOWNLOAD PDF. fhe simplest solution consists in approachingthe eye as closelyto the object as p o s s i b l e. To overcome this difficultywe have to avail ourselvesof lensesor lens systems. The effectof such an auxiliarymeansis, in each case,that the object located a short distance in front of the eye-or even an image of such an object-is imagedat a greaterviewingangle and a sufficient distancefrom the eye to allow observation without any particularstress on our m e c h a n i s mo f a c c o m m o d a t i o n.

Such a lens is called a magnifier. lts magnificationis definedas the relationshipbetweenthe tangentfunctionsof the two viewing angles,a certainvalue having been adoptedas the normalviewingdist a n c e ,v i z. Using this value,we o b t a i nf o r t h e n u m e r i c avl a l u eV Lo f t h e m a g n i ficationof a magnifierof focal lengthfL: ,r, - v L - f , lf higher magnificationsare required, simplelensesare no longersufficient. In this case,the requirementsto be made of image quality can only be satisfiedby lens combinations. However,the magnificationwhich can be achieved in a single magnification stage, as in a magnifier,is limited because technicalproblemsonly allowthefocal length to be reducedto a certaindegree:the lenses haveto be curvedever moresteeplyand their diametersthus become smallerand smaller.

This results in difficultiesnot only in manuf a c t u r i n g ,b u t p r i m a r i l yi n u s i n g t h e m : t h e viewing distance is greatly reduced, the image brightnessis low and the visual field small. These disadvantagescan be overcomeif two successiveimage-formingsystems are used as is the case in the compound microscope: The first stage of image formation consists of a lens system,the microscopeobjective, located close to the object, which forms a real and magnifiedaerial image of the object, usually at a certain distance from the latter. The relationshipbetween image size and object size,the scale of the image M,ni, is governed by optical laws and is represented by the relationshipof the separation between the image and the primary focal point of the objective,which is called the "optical tube length t", and the objective focal lengthfoui,viz.

the detail of fine object structuresit contains,however,has nothing to do with the scale at which the objective reproducesthe object. On the contrary-as Abbel was the first to prove-it dependsnot only on the wavelengthof the light used for observation,but primarilyon the light-admitting propertiesof the objective. These are determinedby the apertureangleof the cone of rays from the pencil originatingat the object, which is able to enter the instrument through the aperture of the objective. The measure of this angle is-likewise since Abbe-the numericalvalue of the sine function of half the apertureangle.

lf the pencil originating at the object does not pass through air before it reachesthe objective, but through another medium of differentrefractive index, the angle must be multiplied by this index. Becauseof its importancefor image formation in the microscope,Abbe coined the term numerical aperture for the product of the sine of half the aperture angle and refractiveindex. Thus if this rerm is abbreviatedN. applieswith regardto their separationd. The cone of light varies as a function of the numerical aperture. I Ernst Abbe , physicist and professorat Jena. From worked for the ZEISS Optical Works.

Nothing can be said about their shape. To reproduceobject configurationswith a reasonabledegreeof similarity, we must remain considerably-by a factor of about 5 to 1O-above the limit of resolutionfor the detail in question. The second stage of image formation in the compound microscope is exclusively designedto spread the image produced by the first stage so that all detailscan be conveniently recognized by the eye. For this purposethe aerial image formed by the objective is viewed through a lens systemacting like a magnifierand called the eyepiece. It is natural that even the highest eyepiece magnificationcannot show the eye more than the aerial image in accordance with the resolving power of the objective.

There is thus no point using a higher eyepiece magnificationthan is requiredto make the resolveddetailof the aerialimagevisible. Abbe realizedthat it was sufficientto use a total magnificationof the objective-eyepiece system of to x ihe objectiveaperture. He coined the term usefulmagnification for thisrange. f"" - f micr t , lmicr: E y e p ie c e Intermediate lmage Objective Specimen Schematic drawing of the light path in the microscope fobi ' focl 1 A c l o s e rl o o ka t t h i sf o r m u l ac l e a r l ys h o w s the advantageswhich the compoundsystem has over the simplemagnifyingsystem: D u e t o t h e p o s s i b i l i t yo f c o m b i n a t i o na, multitude of total focal lengths can be achievedwith only a few elementsof different focallength. Since the focal lengths of the different components remain large as compared to the focal length of the overall system, it is possible by appropriate selection of the formerto obtain practicallyany desiredshort overallfocal length.

This meansno lessthan that the magnifyingpower of a microscopeis a c t u a l l yu n l i m i t e d. However,sufficientlyhigh resolvingpower a n d a m a g n i f y i n gp o w e r h i g he n o u g h t om a k e the resolvedimage detail clearly visible still do not enablea compoundsystemto present the eye with an undistortedimage of this 10 detail. In addition,the errors inherentto a greateror lesserdegreein any imageformed by the lenses have to be eliminatedto such an extent that the overall system guarantees a largely unaberrated reproduction of resolved image detail. While-as we have seen-the resolving powerat a givenwavelengthof light depends exclusivelyon the objective,the image-forming properties are determined jointty by the objective and the eyepiece, although the primaryinfluenceis the type of objective.

The magnifying power is determined on the one hand by the objectiveand the eyepiece,but on the other alsobythe mechanical system of the microscope connecting the two,becauseits Iengthdeterminesthe optical tube length. Since the demands made with regardto resolvingpower,magnifyingpower and image-forming properties cannot be satisfiedwith a singleobjectiveand eyepiece system, the connecting element, the body tube, must be designedso that the two componentscan be easilydetachedfrom it. This is why the lenselementsof both the objective and the eyepieceare accommodatedin special "mounts". The former have a standard threadby whichthey can be screwedinto the lower end of the body tube. The simpler, tubular mounts of the eyepiece lenses are slipped from above into the suitablyshaped eyepiecetube. Parfocalizationof objectivesand eyepieces To facilitate the exchange of objectives, so-called "objective changers" are usually.

inserted between the objective and the body tube. The location of the plane separaiing the body tube from the objectiveon the one hand and the eyepieceon the other is determined by practicalconsiderations: The tube should always be in the same positionin relationto the specimen. The image must remain in focus when 11 m : mechanicaltube length a : object-to-image distance b : object distanceof objective : intermediateimagedistance of eyepiece - working distanceof the objective objectivesor eyepiecesare changed. ln microscope language,this is called "parfocalizationof objectivesand eyepieces". To satisfythe latter requirement,which is essentialfor undisturbedwork with the microscope,the optical tube length cannot be the same for all types of objectives. lt is the distancebetweenthe specimenand the aerial image that must be kept constant. With a given mechanicaltube length this can only be achievedby appropriatedesignof the objective mount.

The length of this must be chosen so that the separationbetween the object plane and the undersideof the body tube againstwhich the objectiverests when it is screwed in is the same, and the lens systemis positionedso that the aerial image will always be formed in the same plane in the tube, regardlessof the objective focal length. The measureof the distancebetween objectiveplaneand objectivescrew flangeis the so-calledobject distanceof the objective. ln order that the image will remain in focus when the eyepiecesare exchanged, the eyepiecefocal plane must always coincide with the real aerialimage.

In otherwords,the eyepiece flange must also be located at a fixed distance intermediateimage distance of the eyepiece from the plane of the aerial image in the tube, and the eyepiecemounts must be so designedthat their focal plane is alwaysat a fixed distancefrom their seating. Severalpoints have to be taken into account when fixing the three mechanical dimensions:ihe o b j e c td i s t a n c eo f t h e o b j e c tive,the mechanicaltube lengthand the intermediateimagedistanceof the eyepiece. The object distance of the objective is preferablychosen so that the objective of lowest power that is used frequentlyas well as objectivesof particulariylong construction can still be parfocalized.

A reasonablevalue has been found to be 45 mm, which we have been using for all our transmitted-light objectivessince The intermediate image distance ol the eyepieceshould be chosenas short as possible to allow eyepiecesof short focal length also to be parfocalizedwithout difficulty. With our eyepiecesit is 10 mm. The mechanicaltube length should above all be chosenso that the microscopecan be dimensionedto suit its purposewithout bec o m i n gu n w i e l d yT. For the normal transmitted-lightmicroscope,the combinationof thesethree magnitudes results in a distance of mm between the specimenand the aerial image. Object distance of objective 45 mm mechanical tube length 1 6 0m m intermediateimage planeof eyepiece 1 0m m objectto-image distance 1 9 5m m Once the tube length has been fixed, the total magnificationof the microscope only depends,in addition,on the focal lengthsof objectivesand eyepieces,i.

the scale of the aerial image and the eyepiece magnification. Appropriateselection The user of the microscopewill find it of of inilial magnifications advantageif these two factors are chosen so of objectives and eyepieces that a Iarge number of total magnifications can be achievedwith a minimumequipment outlay. Such a series can be consideredas well coordinatedonly if it satisfiesthe followingconditions: The relationshipof every component in the serieswith the one precedingit and the o n e f o l l o w i n gi t s h o u l d b e o f e q u a l m a g n i tude. It should be possibleto obtainserieswith larger increments by leaving components with smallerincrementsout of a basicseries.

It is containedin the draft standardon microscope magnifications,DIN 58,,and is composedas follows: StandardSeries 10 l. When deciding on the characteristic values of objectivesand eyepieceson the b a s i s o f s u c h a s e r i e s ,t h e f o l l o w i n gp o i n t s mustbe takeninto consideration: There should be 4 to 5 main objectives with the aid of whichthe rangeof total magnifications requiredfor practicalwork can be c o v e r e ds, i n c eo n l yt h i s n u m b e ro f o b j e c t i v e s can be mountedon the conventionaltype of objectivechanger revolvingnosepieces. T h e v a l u e sf o r t h e i n i t i a lm a g n i f i c a t i oonf the objectivesand eyepiecesmust also be taken from the aboveseries. Only in rare cases and in the case of special-purpose objectives have important reasons prompted certain deviations. Series of initial magnifications of objectives Basic series Main series S i m p l i f i e ds e r i e s 2. In general, the largestapertureis used that is possible and justified under the circumstances.

The numericalaperturesapplyingto our objectives may be taken from the different objectivetables. Field of view and viewing angle In the compound microscope,the image is sharplylimitedby a diaphragmin the eyepiece which is called the eyepiecefield stop. Its diameterdependson the focal lengthand type of the eyepiece and is limited by the inside diameter of the tube accepting the eyepiece. This diaphragm allows only a certainportionof the real intermediateimage to be viewed. The diameter of this field is called the field-of-viewnumber. In the tables included in this booklet it is indicated for eachof the eyepieces. This numbermakes it possibleto determinethe diameterof the object portion which can be covered with the eyepiecefield of view. This so-called obiect field is determinedby dividing the field-ofview number by the initial magnificationof 15 the objective used-if necessarymaking alIowance for a factor due to body magnification or an intermediateoptical system.

The field-of-viewnumber and the eyepiecefocal lengthalso serveto determinethe viewing angle under which the eye sees the entireimage. lf S is the field-of-viewnumber, then the viewing angle w results from the expression. All factors determining the magnifying power of the compound microscopeand its relationshipto the resolvingpower given by the apertureof the objective rangeof useful magnification can be representeddiagrammatically as is shown by the following example of a typical series of objectivesand eyepieces. The horizontal ines in the diagramrepresentthe steps by which the total magnification increases in accordance with the standard series, page The solid lines from the lower right-handcornerto the upper left-handcorner are guide lines for the objectives, the magnification and numerical aperture of which are indicated beside the l o w e re n d o f t h e g u i d e l i n e.

The eyepiece magnificationand the field-of-viewnumber a r e i n d i c a t e db e s i d e t h e i r l o w e r e n d. T h e guide lines for the eyepiecesintersectthose of the objectivesat the steps which indicate the total magnificationof the corresponding c o m b i n a t i o n. Of these, the following affect image points even near the optical axis: sphericalaberration s i n ec o m a longitudinalchromaticaberration chromaticdifferenceof sphericalaberration. Towardsthe edge of the field,the following aberrationsare increasinglyevident: coma astigmatism curvatureof field distortion chromaticdifferenceof magnification. It is impossibleto correct all these aberrations at once and completely. They can only be more or less reduced, greater emphasisbeing placed on the reduction of some than othersdependingon the intended use of the opticalsystem. Thetechnicalmeansrequiredfor the satisfactory correction of optical aberrations dependprimarilyon the degreeof perfection d e s i r e d ; i n a d d i t i o n ,t h e y d e p e n d o n t h e desired numericalaperture.

Special attention must be paid to the effect which the cover glass generallyused in the microscope for examiningspecimensby transmittedlight h a so n i m a g eq u a l i t yT. h i s i n f l u e n c ei s c l e a r l y noticeablewith objectivesof largernumerical aperturethan 0. lt takes the form of sphericalovercorrectionand must be compensatedby an appropriateresidueof undercorrection in the objective if the latter is designedfor examiningcoveredspecimens. This is, of course, possibleonly if the overcorrection introducedby the cover glass is always identical,and this is only the case if the cover glass has a certain thicknessand refractiveindex,and the specimenis in very tJl';""? Microscopeobjectivesare normallycorrectedfor a coverglassthicknessof. lf the cover glasses actually used deviate from this nominalthickness, they will produce a more or less disturbingover- or undercorrection,dependingon the numericalaperture of the objective employed.

The following table indicatesthe amount of deviationfrom nominalthicknesswhich is tolerablewithout any noticeableloss of image quality. Cover-glassthickness with dry objectives N. of objective Admissible deviation fromnominal thickness of 0. However, this will be the case only very seldom. Generally,there will be a more or lessthick layerof mountingmediumbetween the focusing plane and the undersideof the cover glass,which has about the same effect on the correction as if the thicknessof the cover glass were increased by the same "effective cover-glassthickamount.

h e r e s u l t i n gi n a c c u r a c yh a sp r o m p t e d objective manufacturers to use special mountsfor all objectiveswith whichsuchfine d ifferencesmatter. Theseso-calIedcorrection collars allow one lens elementto be shifted so that the over- or undercorrectiondue to a deviation of the cover-glass thickness f r o m t h e n o m i n a vl a l u ec a n b e c o m o e n s a t e d. l n g e n e r a lm i c r o s c o p i cp r a c t i c ei t w i l l n o t be possibleto measurethe effectivecoverglassthicknessdirectly. lt is thereforenecessary to use indirectmethodsto determinethe correctsettingof the correctioncollar.

The only method which can be used in all circumstances and at the same time ensures the most accurate settinq of the correction collar, consists in measuring the effective cov-er-glass thickness with the aid of the microscooe:. g So b jective, the condenser is stopped down to half the obiective 9perture. The corresponding readings of the fine adjustment are noted down. The latter'is preferably determinei once a n d. F o a t h i s p u r p o s e , t h e thickness D, of a few ordinary cover glasses is acctiratblv determined by means of a. measuring-aid micrometer, dial gage , whereupon thelr optical thjckness D, js measured with the mlcroscope as described above. Example: K iJto be determined with two cover qlasses of diflerent thickness. Measurements show the followino thickn esses.

Cover glass No. It follows from the aforesaidthat objectives designedfor use with cover-glassspec i m e n s c a n n o t b e e m p l o y e df o r e x a m i n i n g uncovered specimens. For use with uncovered specimensspecially corrected obiectivesare available. l t c o n s i s t si n u s i n ga l i q u i db e t w e e nt h e specimenand the front surfaceof the objective, which if possibleshould have the same optical propertiesas the glass of the front lens homogeneousimmersion. n 'sino this will also increasethe resolvingpower by 21 the factor n, an advantagewhich today is f requentlyconsideredas the primarypurpose of immersion. Since an objectivecan be far better corrected for homogeneousimmersionthan a dry system of identicalfocal length and numericalaperture,it may also be of advantage to use the immersionmethodwith systemsof longer focal length. This gives objectives p e r m i t t i n ga h i g h e re m p t y m a g n i f i c a t i oann d thus makingit possibleto covera wide range of resultant magnificationsby simple exchange of eyepieces.

Another advantageof the immersionmethod is that neither the cover-glasssurface nor the front lens of the objectivereflectany light so that for critical work the image is of c o n s i d e r a b l yh i g h e r c o n t r a s tt h a n w i t h a n otherwiseequivalentdry objective. Since the optical characteristicsof the immersionliquids have to be taken into account in the computationof the objectives, similar to those of the cover glass, it is essentialto use only the prescribedimmers i o n o i l. Insteadof the usual oil refractiveindex n o [ 2 0 oC ] : 1. Water immersionis used for examiningobjects in water. Glycerin is used if for some reasonthe objectivefront lens and the cover glass are made of amorphous quartz and approximatehomogeneityis desired.

Objectives designed for homogeneous immersionmay be used with coveredor uncovered specimens. The cover-glassthickness is naturallyof no importancewith these systems. lt is differentwith present-dayimmersionobjectives,in which the principleof 22 homogeneityhas beenabandoned. This point should be rememberedif immersionobjectives computed for covered specimensare also employedfor viewingsmearswhich are left uncoveredto save trouble. This is normally the case in the examinationof blood and bacteria smears. While the slight degradation of the image thus produced may still be tolerablefor routinework, the trouble of covering the specimen should definitely n o t b e s h u n n e di n c r i t i c a w l o r k w h e r ef u l l u s e is made of the high performanceof the objective.

lt is true that the lack of a coverglass can be made up by other means,such as the use of immersionoil of higher refractiveind e x - n o 2 0 o C : 1. Finally,cbjectivesspeciallycorrected for uncoveredspecimens,as normally employed for reflected-lightwork, may also be used for this purpose. ZEISSobjectives classificationof objectives 23 The different types of objectives are generallyclassifiedin accordancewith the degree to which their aberrationshave been corrected,their designationindicatingchromaticcorrectionfirst. This also automatically constitutesa classificationaccordingto the technicalmeans requiredfor achievingtheir respectivedegreesof correctionand hence their price categories. We distinguishbetweenthe followingcorrectioncategories: achromaticobjectives, semi-apochromaticobjectives, apochromaticobjectives. In their original form, all objectives in thesethree categoriesexhibitfield curvature which increasesconsiderablywith decreasing focal length.

As long as they were primarily used for visual observation,this was not felt as a seriousdrawback,because any desired point in the field of view could easily be focusedwith the aid of the fine adjustment. However,since the techniquesof photomicrographyhave assumed such importance,new typesof objectiveshavehad to be developedin which the curvatureof the field is eliminatedto a sufficientdegree, in addition to the other aberrations. Years of computation were required to solve this extraordinarilydifficult problem in a satisfactory manner. In our firm introduced the first objectivesgiving a flat field, under the designationPlanachromats.

ln the meantime, countless improvements have been made in these objectives. As a result of this untiring work, a state has now been reachedwhich permitsnot only achromatsbut also apochromatsto be made as flat-field objectives. Thus the aforementioned three categories of objectives are supplementedby those of the Planachromats and the Planapochromats. There are objectivescorrected for the observationof cover-glassspecimens and others for use with uncoveredspecimens. While the objectives corrected for covered specimens are mounted and parfocalizedso that they may be usedfor transmitted-light work, the objectives for uncoveredspecimensare-with few exceptions-designedfor use in conjunction w i t h v e r t i c a li l l u m i n a t o r s. To satisfythe special requirementswhich haveto be madefor observationby polarized light strain-freecomponents,provisionfor accuratecenteringof objectives ,objectives in centeringmountsare supplied,the optical componentsof which are manufacturedand mountedwith specialprecautionsto guarantee completefreedom from strain POL objectives.

In principle,practicallyall objectivescan be equippedwith phase platesfor use of the Zernike phase-contrastmethod. Our manufacturingprogram includesa wide choice of such objectives. Our opticaldesignersare today usingthe most advanced techniques and the latest glass types. They are constantlystrivingto find the best for the microscopeoptics we manufacture. the best that can be achieved with the meanspresentlyat our disposal. The use of highlyperfectedglasstypesmay,however, occasionally have the disadvantage that a greater sensitivityto acids and water vapor is unavoidable. lt is obviousthat this appliesaboveallto the most highlycorrected and therefore most expensivetypes of objective-if only in a few cases.

Allowancefor this fact can be made by usingonlythe lesscostly objectivesfor work with acids. A lens error which has a very important influence on the satisfactoryimaging of a visualfield of a certainextensionis the chro- 25 matic differenceof magnification. Eversince Abbe'stime,this error has generallynot been correctedin the objectivebut by meansof an eyepiecehavingan error of identicalmagnitude but oppositedirection. Such eyepieces are called compensatingeyepieces. ln order that a singleseriesof eyepiecesmay be sufficient-a fact which is today consideredindispensablein the interestsof easyoperation of the microscopeby less experiencedpersonnel-all our objectives have the same lateral chromatic aberration. The fact that this is the casewith all our objectivesensures that the user of our microscopesneed not bother about which type of eyepieceto use for a certainobjective. Any of our eyepieces will do.

However,our objectivesshouldnever be combinedwith eyepiecesof anothermake if a more or lessseriousloss of imagequality is to be avoided. The differentcategoriesof objectivesare : d istinguishedby thefolIowingcharacteristics Achromats Achromatsare lenscombinationsin which, to keep the price down, only the back focal distancesfor the colors blue and red of the spectrumhave been made equal. This gives the mostfavorablecorrectionfor the brightest regionof the spectrum. ln this region,spherical aberration and sine coma as well as astigmatismhave,of course,been eliminated as far as necessaryor feasiblewith the means available at this price level. The residual chromaticaberrationin this type of objective c a n b e s e e n u n d e r o b l i q u e i l l u m i n a t i o na s violet and yellowish-green color f ringes around dark object details. Under straight i l l u m i n a t i o na n d w i t h t h e s p e c i m e no u t o f focus, it appearsas a weak violet cast above the plane of sharp focus and as a weak yellowish-greencast below that plane.

These secondary colors are all the more pronounced, the better the other aberrations 26 have been corrected. Altogether,however, they are generallynot bad enoughto disturb visualobservation. The focal lengths of achromaticobjectives are chosen so that the upper limit of usefulmagnification can be reachedwith eyepiecesof relativelylow power. for measuringand counting. Achromaticobjectivesare employed for routine work, for equippingteaching microscopesand for all applicationsin which critical observationis not required.

lf due allowance is made for their characteristics, these objectivesmay also be usedfor photomicrography,even for color photography. We now only manufactureachromatsin simplemounts and exclusivelyfor transmittedlight. Planachromats Planachromatsare objectivesof improved chromaticcorrection. in which the curvature of field has been eliminatedpracticallyentirely even for the largest field of view encounteredin the microscope. This,of course, requiresa much greateroutlaywhich results i n a c o r r e s p o n d i n g lhyi g h e rp r i c e. D u et o t h e importance of field flattening for viewing polished specimens under vertical illumination,almost all our objectivesfor this type of work are Planachromats. They are then called EPIPLANobjectivesand should be used togetherwith Kpl eyepieces. For reflecied-lightmicroscopywe have 1. The objective acts as its own condenser.

r i g h t - f i e l di l l u minationis attainedas describedabove. In 27 d a r k - f i e l di l l u m i n a t i otnh e t i g h ti s g u i d e dp a s t the objective and concentratedin the specimen plane by meansof concentricmirrors or concentriclens systems. The concentric mirrors or lens systems are combined with the objectiveto form one unit. NEOFLUARS Using fluoriteinsteadof crown glass,microscope objectivescan be built which are distinguishedby considerablyimprovedcorrectionof aberrationsalthoughthey havethe same number of lens elements as achromatic objectives. The design we use for our "NEOFLUARS" and which can be traced back to R. Winkel comes very close to the correctionof apochromaticobjectives. Only secondary color has not been completely eliminatedalthough it is far less noticeable than with the achromats.

lt is obviousthat the I i m i t e dn u m b e ro f l e n s e l e m e n t su s e d i n t h e NEOFLUARSdoes not allow a correctionfor field curvature. However,the low number of glass-to-air surfaces in these objectives ensuresa minimumof flare so that they produce images of surprisinglyhigh contrast. The excellent correction of NEOFLUARS makes it possible to achieve considerably higher numerical apertures than in achromatic objectives. Thusthe N. i larly well suitedfor phase-contrast work. Planapochromats With the aid of special glass types, which were then new, and fluorite,Abbe was the first to succeed, in the eighteen-eighties, in computing objectives of equal back focal distancefor more than two colors and, at the same time, far-reachingcorrection of the 28 other aberrationsas well. Abbe announced this new type of objective,which he called apochromat,on July 7, Ever since, it has been continuallyimprovedand today it is so highly developedthat further improvement appearshardlypossible,all the more so as it now gives a perfectlyflat field without sacrificing any of its other characteristics.

Since this has become possible we only whichwe manufactureflat-fieldapochromats, "Planapochromats". Owing to the apocall chromatic correction of these objectives' residualchromaticaberrationcan no longer be recognizedin the image. lt is, of course, necessaryto use suitable eyepieceswhich compensatefor the chromaticdifferenceof magnification. The numericalaperture of our Planapochromats has been increasedto a few per cent abovethat of the NEOFLUARobjectives. They thus representthe ultimatein performance that is possible today-and probably that is possibleat all. As a result,these objectivesare usedwhenevermaximumresolution is requiredfor extremelycritical work. It is obviousthat they are superiorto all other typesof objectivein color photomicrography. Planapochromatsshould always be combined with Kpl eyePieces. Only amorphousquartzand fluorite are suitable. Since for manyyears it seemed impossibleto achievechromaticcorrectionevenjust for a small regionof the spectrumwith the aid of thesetwo materialsalone,so"Monochromats"were at first introcalled 29 duced, which were corrected for only one wavelength.

Only recently have our optical designersaccomplishedthe feat of computing a series of objectivesof excellentchromatic correctionover the very large spectral regionfrom m4 to m4. Sincethen we have been making only one series of objectivesfor ultravioletmicroscopy. The high-powersystems,which may touch the cover glass, are equipped with resilientmountswhich give way if they knock a g a i n s tt h e s p e c i m e n. T h i s g u a r a n t e e sa d e quate protectionof both the specimen and the objective front lens. The mount of the immersionobjectives-exceptthe achromats -can be locked in retracted position so as to facilitateapplicationof the immersion liquid.

In view of the Iarge number of objectives with differentcharacteristics which we manufactureit has beenfound convenientto make them differexternallyas well,so that the user will recognizeaI a glance what type of objective he has before him. In addition,the immersionmedium indicatedby the color of the ring is also identifiedby an abbreviation afterthe objectivedata. The followingcolors and abbreviateddesignaiionsare used on immersionobjectives: lmmersionobjectives Table4 lmmersion Color medium of ring black oil Water white Glycerin orange Methylene iodide yellow Designation Oel W Glyz Methylenjodid Apart from the trade mark,our objectives are engravedf irstof alI with a f igure indicating the scaleat whichthe realintermediate image is reproducedatthe object-to-image distance fixed for our microscopes,i.

the initial magnification e. Below these two figures there may be additional data indicatingthe mechanicaltube lengthor the cover-glassthicknessfor which 31 the objectivesare corrected,as well as the s e r i a ln u m b e r. On objectivessensitive to deviationsfrom the prescribedcover-glass thickness, the cover-glassthicknessfor which they are correctedfollowsthe figureafter a stroke. lndicationsreferringto cover-glassthickn e s sh a v et h e f o l l o w i n gm e a n i n g : "0. the objective may be used with or without cover glass. those containing strain-freelenses for polarized-lightmicroscopy, phase-contrastobjectives,etc. This color code,which is independentof the type of objective,is explainedin the followingtable. Table 6 Color code for initial magnification lnitial magnification Color of ring 1 X 2.

v- e l l o w dark green briqht dark. T h i s i s d u e t o t h e f a c t t h a t i t is possible neither to achievea sufficiently small scale of reproductionin a compound microscope,nor to magnifythe portionof the aerialimagecoveredby the eyepiecebeyond the limit imposed by the clear diameter of the tube. lf larger object fields are to be photographedat small scalesand with a flat field,we may only use a singlemagnification stage,i. an imageof the specimenmust be emulsion formed directlyon a light-sensitive by means of an objective of suitable focal length. Wherehigh imagequalityis required, specially developed systems are used the design of which is similar to that of photographic lenses.

ln addition,it is advisableto employ a camera of variableextension. To cover a wide rangeof imagescales,we need "photomicrographicobjeca series of such tives" with carefullyselectedfocal-lengthincrements. These incrementsdepend on the degreeto whichthe cameraextensioncan be varied. Of course the extension is always limited. We manufacturesuch photomicrographic objectivesunderthe designaiionLUMINARS. For furtherdetails,see the operating instructionsfor these instruments. LUMINARSare always used without eyepieces. The shorterfocal lengths 16,25 and 40 mm may occasionallyalso be combined with eyepiecesand used like ordinarymicroscope objectives. In this case,however,eyepieces must be chosen to match the correction of the LUMINARS. Suitabletypesare the eyepiecesof our stereomicroscopes and Ctype eyepieces. ZEISSeyepieces Types of eyepiece 34 As was mentioned in the introduction pageB ,the eyepieceis designedto present to the eye the object detail resolvedby the objective and contained in the real interm e d i a t ei m a g eu n d e r a v i e w i n ga n g l ew h i c h is sufficientlylargefor easy recognition.

This alone could be achievedwith a simple converging lens, but no influence could be exerted on aberrations. lf this is desired, such single-elementeyepieceswill have to be replacedby more complexsystems. In practice,however,these can be made only with relativelyshort focal Iengths,because on the one hand their diameter increasessharplywith growing foeal length, while on the other the exit pupil of the microscope-i. the image of the objectiveaperture formed by the eyepiece,which represents the plane where the observer'seye pupil must be located-is movedto an inconvenientlylong distance away from the eyepiece lens. Both these drawbacksare eliminatedby constructingthe eyepiecesf rom two more or less widely spaced components.

one of which is locatednear the aerialimage. Here it affects primarilythe imaging of the p u p i l , w h i l e t h e s e c o n d c o m p o n e n tt a k e s over the eyepiecefunction proper, viz. that of magnifying. The field lens may be located before, in or behind the real intermediate image. lf it lies before the aerial image, it will reducethe latterby a certaindegreeand shift it towards the objective. Eyepiecesof this type are called Huygenianeyepieces. lf the field lens is locatedbehindthe real intermediate image,then, of course, it does not modify the latter. This is particularlyfavorwith the able for the purposeof measurement aid of micrometerdisks arrangedin the image plane. Eyepieces of this type are called Ramsdeneyepieces. With short focal lengths,however,the latter type allows the exit pupil to be locatedfurtheraway from the eye lens.

This is why eyepiecesof long focal length are usuallydesignedon the Huygens principle,those of short focal length on the Ramsden principle. Severalelementsare invariably required per component if any influenceis to be exertedon the aberrationsof the eyepiece itself or the residualerrors in the imageproducedby the objective. Thus it has beengeneralpracticeeversincethe time of Abbe to compensatefor a rathertroublesome error frequentlyexhibited by the objective image and difficult as well as costly to correct in the objective-the chromatic difference of magnification-by using eyepieces which exhibit the same but opposite aberration. In addition,attemptshaveoccasionally been made to reduce field curvature by means of the eyepiece. Eyepiecescompensatingfor lateralchromaticaberrationare known as compensatingeyepieces.

To facilitatethe use of our microscopes, we have computedall our objectivesso that the chromaticdifferenceof magnificationin the real intermediateimage they produce is alwaysthe same. We can thereforebe content to supplycompensatingeyepieceswhich make up for this degree of lateralchromatic aberration. This matchingof objective and eyepiececorrection,introducedin the interests of our customers,is ihe reasonwhy we have to warn our customersagainst using eyepiecesof other manufacturewith our objectives. The eyepiecesfor our stereomicroscopes, however,are not designed on the principle explainedabove. They have no compensat- 36 the ing effeci,becausein stereomicroscopes optical systems of the first magnification stage are also free from lateral chromatic aberration. Theseeyepiecesthereforecannot be combinedwith the usual microscopeobjectives. Intermediate systems changing the magnification During practical use of the microscope, a change of magnification by means of changingeyepiecesis frequentlyconsidered inconvenientand troublesome,becauseihe eyepiecesnot being used at the momentare detached parts which may get lost or damaged.

To counter this disadvantage' systems have been magnification-changing insertedbetweenthe objectiveand the eyepiece of the microscope. These may either be designedfor a stepwisechangeof magnification-whichwould correspondto a change of eyepieces-or as continuously variable systems. ln the latter, however, a more or less noticeableloss of image quality is unavoidable. We have therefore adopted the system of changing the magnification by steps. lf only two alternativemagnificationsare required-whichis generallyconsideredsufficient for teaching and laboratory microscopes used for routinework, for instancethen the magnificationchanger may be used.

This is a two-componentsystemmountedso that it can be insertedinto the limb top of our STANDARDmicroscopes STANDARDK' R o r W L. F o r t h i s p u r p o s et h e l i m b t o p i s equippedwith a spindlewhichcan be rotated through 90o and on which the magnification changer is secured by means of a coaxial screw. This arrangementoffers the advantage that the magnificationchanger is normally firmly attachedto the microscope,but can be removedif necessarY. The followingmagnificationchangersare available: 37 see 0. l f a r a p i dc h a n g eo f m a g n i f i c a t i oinn m o r e than two steps is desired,it is necessaryto employ a more complicatedoptical system such as that contained in our OPTOVAR. H e r e t h e a e r i a l i m a g e p r o d u c e db y t h e o b jective is first shiftedto infinityby means of a lower Telan lens of negativepower. This image is then viewed through a telescope system mounted above it. In the present case, the telescope system consists of an upper Telan lens of positivepower mounted at the lowerend of the tube and representing the telescopeobjective,and the usual microscope eyepiece.

T h e l a t t e ri s d e s i g n e ds o t h a t small Galileantelescopescan be insertedin the space betweenthe two Telan lenses. The magnifyingfactors to be l iththe magnification a c h i e v e da r e i d e n t i c aw of the telescope systems. Apart from the factor 1, which is effectiveif no telescopeis in the light path,the OPTOVARcan be set for 1. In addition,anothersystemcan be moved into the light path, which has the effect of a Bertrand lens and permits the exit pupil of the objectiveto be viewed,for instancefor observing interferencepatterns,for centeri n g t h e a n n u l a rd i a p h r a g mi n r e l a t i o nt o t h e p h a s e p l a t e a n n u l u si n p h a s e w o r k , o r f o r checkingthe stoppingdown of the objective.

ln this case its magnificaiionfactor is approx. sysIntermediatemagnification-changing page in table 36 on tems are listed Field-of-viewnumber and size of object field Magnification-changing systems are a convenientmeans of varying the size of the object field covered for a certain field-ofview number of the eyepiecewithout changing any mechanicaldimensionsof the microscope. lf the scale of the real intermediate imageis increasedby meansof suchan intermediatesystem,a smallerobject field will be covered. On the other hand, if the scale of the real intermediateimage is reduced,the objeci field will, of course, be larger' The latter is undoubtedly an advantage in all cases where many specimens have to be scanned.

The only drawbackis that the total magnificationis reduced by the same factor by which the scale of the intermediateimage is changed. This disadvantage,though, can easily be offset by a higher-powereyepiece which should,however,have the same fieldof-viewnumberas the one originallyused. IU With 0. Wide-angle eyepieces have been developed for the observationof larger fieldsof-view. The following table lists the eyepieces and their field-of-viewnumbers. h e s ei n t u r n a r e c o n t a i n e di n a t u b e fitting into the upper end of the microscope lube with the eye lens at the top and the field 40 lensat the bottom. The mountof the eye lens is designedso that its projectingedge may be gripped. The field lens is either located right in the eyepiecetube or likewise contained in a special mounting ring. The outsidediameterof the eyepiecesis standardized. This standard diameter is traditional in the normal microscope. lt is a stand In our stereomicroscopes ard diameterof 30 mm has been adopted.

ln addition,the diameterof the eye-lensmount of all our eyepiecesconformsto the German DIN Standard 58,to facilitate the attachthe eyement of accessories. Consequently, is eyepieces all our lens mount diameterof 28 mm. As is the general practice today, the magnificationof the eyepiecesis indicated " ". Lettersbefore by a figure followed by x the magnificationmark the type of eyepiece. Since we manufactureonly compensating eyepieces,such an identificationwould normally be superfluous. However, our eyepieces of higher power are so designedthat they producea flat field,which is not necessary for the low-power systems. The latter are thereforemarked C compensatingeyepieces to distinguishthem from the former marked Kpl compensatingf lat-field eyepieces. The fact that the eyepiecesare used to view a real image may be utilizedto make a sharp image of a reticule, graduation and otherfiguresor pointersvisibletogetherwith this object image.

These figures are engraved on glass plates micrometerdisks which are insertedin the diaphragmplane of the eyepieces. However,since they will not necessarilybe seen sharplywith normaleye- 41 pieces,above all if the eye of the observer is not free from visual defects,eyepieceswith a focusingeye lens are used for this purpose. In addition,theseeyepiecesare designedso that the micrometerdisk can be easily,inserted and will be centered once it is in position. The micrometer disks normally suppliedby us are Iistedon page For polarized-lightmicroscopy the crosshairs marking the center of rotation of the stage must be very accurately centered. Since this cannot be achieved by the mere insertionof crosshairdisks,we manufacture special eyepieces with accurately adjusted crosshairsor crosshairmicrometerdisks for this purpose.

Download Introduction to Optical Microscopy full book in PDF, ePub and kindle written by Jerome Mertz and published by Cambridge University Press which was released on 31 July with total hardcover pages You could read this book directly on your devices, the book become popular and critical acclaim in Medical, check detail and related Introduction to Optical Microscopy books below. Presents a fully updated, self-contained textbook covering the core theory and practice of both classical and modern optical microscopy techniques. Optical microscopy is used in a vast range of applications ranging from materials engineering to in vivo observations and clinical diagnosis, and thanks to the latest advances in technology, there has been a rapid growth in the number of methods available.

This book is aimed at providing users with a. Fundamentals of Light Microscopy and Electronic Imaging, Second Edition provides a coherent introduction to the principles and applications of the integrated optical microscope system, covering both theoretical and practical considerations. It expands and updates discussions of multi-spectral imaging, intensified digital cameras, signal colocalization, and uses of objectives, and offers guidance. This book provides a comprehensive introduction to the field of scanning optical microscopy for scientists and engineers.

The book concentrates mainly on two instruments: the Confocal Scanning Optical Microscope CSOM , and the Optical Interference Microscope OIM. A comprehensive discussion of the theory and design of the Near-Field Scanning Optical Microscope. Since Sorby published his observations on the structures of steels in , the optical microscope has become one of the most widely used and versatile instruments for examining the structures of engineering materials. Moreover, to examine the diverse range of materials encountered, it must be used in both the reflected-light and. Introduces readers to the enlightening world of the modern light microscope There have been rapid advances in science and technology over the last decade, and the light microscope, together with the information that it gives about the image, has changed too.

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OPTICAL MICROSCOPYDavidson and Abramowitz 5 the classic Rayleigh equation often cited for resolution (2, ): d = (l / 2NA) (1) Where d is the space between two adjacent Microscope Maintenance blogger.com - Free download as PDF File .pdf), Text File .txt) or read online for free. Scribd is the world's largest social reading and publishing site. Optical Atomic Force Microscopy (AFM) Principle: 1. The molecular force is a strong function of the separation between two object 2. The force can be monitored by the deflection of a cantilever 1. FUNDAMENTALS OF LIGHT MICROSCOPY 1 Overview 1 Optical Components of the Light Microscope 1 Note: Inverted Microscope Designs 3 Aperture and Image Planes in a 01/12/ · Download full-text PDF. Read full-text. Download citation. Copy link Link copied. strikes a specimen, and enters an optical microscope. (As shown in US Patent #6,, The Olympus Microscope Screen Saver offers views of the latest Download our latest review article on optical microscopy and in PDF format. Compound binocular light microscopes ... read more

We now only manufactureachromatsin simplemounts and exclusivelyfor transmittedlight. For reflecied-lightmicroscopywe have 1. Coding for Optical Channels. Eyepieces of this type are called Ramsdeneyepieces. This micrometer-disk turret reflectsall the differentconditions of the Steel and lron Standardin conjunctionwith the turreI4T Type 'c' micrometer-diskturret, 47 41 22 "ferritegrain sizes and " This double turret is identicalin design to the turret , with the only differencethat it coversthe grain size ratios a n d4 : 1.

lf only two alternativemagnificationsare required-whichis generallyconsideredsufficient for teaching and laboratory microscopes used for routinework, microscope optics pdf download, for instancethen the magnificationchanger may be used. Our manufacturingprogram includesa wide choice of such objectives. Glycerin is used if for some reasonthe objectivefront lens and the cover glass are made of amorphous quartz and approximatehomogeneityis desired. The Evolution of the Microscope by S. The new second edition has been. We now only manufactureachromatsin simplemounts and exclusivelyfor transmittedlight. As long as they were primarily used for visual observation,this was not felt as a seriousdrawback,because any desired point in the field of view could easily be focusedwith the aid of the microscope optics pdf download adjustment.