. The book of photography; practical, theoretical and applied. Fig. 702.— ATIC BdLLs-EYE Condenser. fitted to the stand holding the lamp (). The bulls-eye condenser is used withlow powers, and is placed between thelamp and the microscope. The collectivelens of Zeiss with an iris diaphragm is animprovement on the ordinary condenser,as it transmits only a circle of lightsufficiently large to be utilised by the ob-. Fig. 700.—Bclls-eye Condenser, Fig. 701.—Bulls-eye Uundenseu Attached tu Lamp. compensation eyepieces is also in ac-cordance with their magnifying powers, 2, 4, 6, 8, 12
. The book of photography; practical, theoretical and applied. Fig. 702.— ATIC BdLLs-EYE Condenser. fitted to the stand holding the lamp (). The bulls-eye condenser is used withlow powers, and is placed between thelamp and the microscope. The collectivelens of Zeiss with an iris diaphragm is animprovement on the ordinary condenser,as it transmits only a circle of lightsufficiently large to be utilised by the ob-. Fig. 700.—Bclls-eye Condenser, Fig. 701.—Bulls-eye Uundenseu Attached tu Lamp. compensation eyepieces is also in ac-cordance with their magnifying powers, 2, 4, 6, 8, 12, and 18. The Bulls-eye Condensek. The simplest form of condenser or lightcollector is known as the bulls-eyecondenser (Fig. 700). This is a single plano-convex lens mounted on a stand with aball bearing at the top and a sliding rod,so that it may be placed accurately inthe best position for concentrating thelight on the object. It is sometimes jective ; with the incandescent light itserves to eliminate the structure of themantle. The aplanatic bulls-eye condenser(Fig. 702) is a doublet (Mr. E. M. Nelsons),which gives much more brilliant illumina-tion without so much spherical aberration. Stage and Sub-stage Coxdexseks,Diaphragms, etc. The bulls-eye condenser cannot be usedalone for illumination when high powersare employed; for these some form ofstage or substage condenser has to be 532 THE BOOK OF PHOTOGHAFHY. em
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