| 摘要 |
<p>PURPOSE:To make a device inexpensive, by placing an optical system in an incident optical path of a photodetector, also placing a filter on an image forming position of the optical system, switching the filter, and switching the photometric distribution. CONSTITUTION:At the time of photometry, a transmission light beam of a photographing lens 1 is reflected by one or both of a shutter screen 3 and a film 4, and its reflected ray is detected photometrically by an optical detector 10 through an image formation lens and a filter 9. In this case, the image formation lens 8 forms or nearly forms a shutter screen surface and a film surface on the filter, and this formed image is photometrically detected by the optical detector 10. This filter 9 switches the photometric function by arraying element filters whose tansmittivity distribution is different, in accordance with the photometric function such as partial photometry, mean photometry, etc. and switching each element filter, or switches the photometric function by varying the transmittivity distribution of the filter.</p> |
