Light compensation for exposure control cameras

Details Light compensation for exposure control cameras Light compensation for exposure control cameras

G - Physics

03

B

95/53, 95/62

G03B 7/20 (2006.01) G03B 7/099 (2006.01) G03B 33/00 (2006.01)

Patent

CA 1042253

LIGHT COMPENSATION FOR EXPOSURE CONTROL CAMERAS ABSTRACT OF THE DISCLOSURE A camera includes a primary lens, a converter lens selectively usable to change the camera's effective focal length and an exposure control device which includes a photocell. The converter lens, movable into and out of the camera's optical path, has predetermined light loss and color contribution factors. A cover glass having approximately one-half the light loss factor and approximately the same color contribution factor as the converter lens is movable from a position affecting the light directed toward the photocell when the converter lens is in the camera's optical path to a position affecting light directed toward the primary lens when the converter lens is removed from the optical path. -1-

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