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In using the Zeiss-Nordenson fundus camera one frequently encounters difficulties in connection with the carbon arc light source. The carbons must be frequently realined as they are in use, with the subsequent need of refocusing. There are momentary changes in the luminosity due to irregularities in the carbons; if this occurs at the moment the film is exposed, overexposure or underexposure results. Not the least of its disadvantages is the need of frequent change to new carbons. If this occurs part way through the course of photographing one patient, one must stop and wait until the mechanism cools sufficiently to permit changing the carbons. The new fundus camera recently constructed by the Bausch & Lomb Optical Company has numerous refinements making for greater ease of operation, but the light source is also from a carbon arc. The Zeiss Company has produced an incandescent light source for their camera, utilizing a
FLOYD G, STITH RB. AN IMPROVED LIGHT SOURCE FOR THE ZEISS-NORDENSON FUNDUS CAMERA. AMA Arch Ophthalmol. 1951;45(1):77–79. doi:10.1001/archopht.1951.01700010080010
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