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January 1940


Arch Ophthalmol. 1940;23(1):161-163. doi:10.1001/archopht.1940.00860130175013

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The photography of small detail of the eye has hitherto been difficult and not altogether satisfactory. Best results require magnification of the image on the film at an exposure of not more than one two-hundredth second, and the lens should be stopped down to obtain sufficient focal depth. The high level of illumination necessary for the exposure must be supplied from a flashlamp in order not to be injurious or uncomfortable to the patient. A single lens reflex camera is required to provide an accurate means of focusing.

We have mounted an Exacta camera on a compound base and fitted a slidably adjustable tube behind a 50 mm. Tessar lens. The minimum length of the tube sets the lens 150 mm. from the film plane to obtain a magnification of two times. The maximum length of the tube is 300 mm. to provide a magnification of five times. To facilitate

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