| 摘要 |
PURPOSE:To prevent that photometry becomes local spot photometry, by using a light emitting back face of the center part of a semitransmitting spring-up mirror, as a diffusing and transmitting face. CONSTITUTION:A spring-up mirror 7 for a finder constitutes the center part containing an optical axis so as to have a semitransmitting property of light, and the mirror back face is formed as a frosted glasslike or milk-white diffusing and transmitting face 7'. Most of beams which have transmitted a photographic lens 1 are reflected and are led to a finder optical system containing video glass 4, a condenser lens 3 and a penta-prism 2, but light which reaches the center part of the spring-up mirror 7 for a finder is divided into reflected light and transmitting light by the mirror 7, the transmitting light is diffused when it is emitted from the back face, and the diffused light is reflected by a photometric mirror 6 and is led to a photodetector 9. |
