| 摘要 |
PURPOSE:To perform photometry only by one photometric means independently of the position of a mirror in a TTL photometer for a single-lens reflex camera by forming 2 kinds of reflecting parts on the mirror. CONSTITUTION:When reflected light from a film surface 5 is to be measured in a single-lens reflex camera, the 1st reflecting part 2 leads the light passed through a half-mirror or a pinhole to a photodetector 3 at the fall of a mirror in regard to switching to the observation status of the mirror and the 2nd reflecting part 4 leads the light from the film surface 5 to the same photodetector 3 at the rise of the mirror. Thus, the photodetector 3 can be used in common at the time of photometry before photographing and also at photographing. |
