| 摘要 |
PURPOSE:To switch each pickup mode of a mamera selectively, by providing a photometry circuit and an automatic diaphragm control circuit to a lens barrel, and controlling the diaphragm in response to the brightness of an objective by a pickup lens barrel itself. CONSTITUTION:In a pickup lens barrel 51 having an automatic diaphragm control functions, a photometry photo electric conversion element 7 is located facing the photodetection plane to a pickup film 10. The lens barrel 51 is provided with a circuit measuring an objective light after stopping down the diaphragm 6, and when a normal diaphragm scale is set to an index, switches SW1-SW3 are switched to a fixed terminal (c) to cause a pickup mode with priority of diaphragm, and when a scale ''A'' is set to the index, the switches SW1-SW3 are switched to fixed terminal (a) to achieve a pickup mode with priority of shutter speed. Thus, the automatic exposure, function at each pickup mode is achieved. |
