| 摘要 |
PURPOSE:To properly measure a reflectance on a film surface without opening a shutter in the case of a single-lens reflex camera by equaling the reflecting angle of a reflected light beam on the film surface, which a light source emits and a light receiving means receives, to that of the reflected light on the surface of a TTL dimming film. CONSTITUTION:The reflectance measuring opening 7 is provided through a screen window 6a without measuring a reflectance, and is constituted such that a reflectance is measured through the opening 7. The position of the light source 5 is set so that the optical axis (a) of a photographing lens and that of the light source 4 can be parallel, and the titled device is designed so that the angle of the TTL dimming light, which is reflected on the film surface and makes incident on a light receiving element 1, and the angle of the reflectance measuring light, which is reflected on the film surface and makes incident on the light receiving element 1, can be equal. Thus a reflectance can be properly measured. |
