| 摘要 |
PURPOSE:To prevent the disturbance caused by a photodetector to the incident luminous flux going to a photosensitive film and at the same time to increase the sensitivity, by providing a lens or a curved reflector between an image forming lens of a camera and a prescribed photodetector. CONSTITUTION:A convex mirror is provided to a quick-return mirror 3, and the position of a photodetector 4 is moved down to a lower place 4'. Thus the luminous flux made incident to a film 5 via an image forming lens from being disturbed by a photodetector 4'. At the same time, the sensitivity is increased by installing condenser lenses L1-LN-1 opposite to photodetecting elements D1-DN-1 of the photodetector 4 (4'). |
