cloth or paper and set at an angle of 45 de-grees. This reflector would then serve for back ground equally withthe clear sky. § 336. Focusing Screen for Photo-Micrography. One cannotexpect a picture sharper than the image seen on the focusing screen.Hence the greatest care must be taken in… … Fig. 149. Zeiss Apochromatic, Projection Objective of 70)>ii)t. equivalent focus, for photo-micography. (Zeisss Catalog.No. jo), This, and another of 33 mm. focus, are designed formaking pictures of moderate magnification. Usually ratherlarge objects are photographed with them. The object may be…
Microscopy
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