| 摘要 |
<p>PURPOSE:To change continuously photometric distributions in both sides of a film, by providing a forward and backward movable aperture part in front of a photodetector and changing the relation of relative positions of them. CONSTITUTION:The light flux from an object passing through a photographic optical system 1 is focused onto a film surface 2. A light flux, which can be led to a photodetector 4 directly or indirectly through a mirror 3, out of diffuse lights discharged from the film surface 2 is limited by moving a hood 5 forward and backward on a photometric optical axis A; and thus, the relation of relative positions of the hood 5 and the photodetector 4 is changed to change continuously a range B1 of the photometric distribution on the film surface 2.</p> |
