Instant color prints have been obtained from the Zeiss fundus camera by utilizing an inexpensive Polaroid color camera. The Polaroid camera is connected to the Zeiss electronic flash cable and photographs are taken through the viewing system of the fundus camera. Information regarding proper focusing and exposure adjustments is given.
Blau RP, Sugar HS. Instant Color Prints Using the Zeiss Fundus CameraA Simple, Inexpensive Method. Arch Ophthalmol. 1971;86(5):552–556. doi:10.1001/archopht.1971.01000010554012