| 摘要 |
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. |
