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January 1957

A New Slit-Lamp Color Camera

Author Affiliations

Columbus, Ohio
Assistant Research Professor, Department of Ophthalmology, University Hospital, The Ohio State University.

AMA Arch Ophthalmol. 1957;57(1):49-51. doi:10.1001/archopht.1957.00930050055012

Although color photographs of good quality have been possible through the conventional slit-lamp microscope with the use of exposures of from a half to one second, it is essential to improve on these speeds if any condition is to be photographed without showing the blur that invariably accompanies slight iris movements, lacrimal flow after blinking, and the movement of the conjunctiva across the sclera that sometimes takes place with concentrated fixation effort.

The reduction of shutter speeds to 1/20 or 1/30 second requires either increased film emulsion speed, greater illumination, or lens systems with a greater light transmission. I have tried all three, and the results of the trials showed that faster film emulsions produce less accurate color reproduction at present, while increase of illumination has to be disproportionate in order to produce an increase of shutter speed. Indeed there is probably a limit to how much light can be

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