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absorbed absorption band achromatic acid angle antipoints apochromatic apparatus back lens blue blue-violet bright-field brightness camera carbon arc chrome Film Cine-Kodak color filter color photography color temperature Compensating Filter contrast convenient correct dark-field illumination detail diameter discussed disk distance Eastman Kodak Company exposure eyepiece factors field focal length focus focused gelatin grams green ground glass illumination beam immersion incandescent inches intensity iris diaphragm Kodachrome Film lamp condenser lenses light source low-power magnification materials medium metallography method microns mounted numerical aperture obtained ocular optical axis optical system ordinary ounces panchromatic photographic photometric filter photomicrography picture pinhole eyepiece plane plate or film possible prints refractive index resolving power safranine satisfactory sensitive separation negatives slide sodium sodium sulfate solution specimen spectral spectrum stained substage condenser substage iris diaphragm suitable tion transmitted light tube tungsten ultraviolet usually vertical illuminator Violet visual wave length Wratten Filter yellow