Optical system for use with cameras incorporating photoresponsive means for exposure control

摘要

1,184,366. Exposure meter acceptance angle control. EASTMAN KODAK CO. May 25, 1967 [May 27, 1966], No. 24383/67. Heading G2A. A camera including a lens 2 and a photoresponsive element 13 for use in automatically adjusting the exposure comprises an optical system for confining the acceptance angle of the photoresponsive element mainly below the horizontal consisting of a cylindrical tube 8 with transparent end-pieces 9 and 10; the inner cylindrical wall of said tube being painted black and being non- reflective; the tube being partially filled with liquid 11 to form an air bubble 12.