| 摘要 |
<p>PURPOSE:To photograph objects always at correct exposure by moving the movable lens group of a variable magnification optical system thereby changing the photometric range of a film plane or shutter curtain plane by a photoelectric transducer for phtometry. CONSTITUTION:A zoom lens 13 which is a variable magnification lens stsyem of variable focal lengths is disposed between a film 6 plane or shutter curtain plane and a photoelectric transducer 12 for phtometry receiving the subject light reflected by both these faces. the photometric range of the film 6 plane or the shutter curtain plane by the element 12 is changed by moving the movable lens group 13a of the lens 13.</p> |
