| 摘要 |
PURPOSE:To attain the coexistence of a photometric system and a focus detecting system in a single optical system and to make the best use of the bottom space of a camera main body by providing an optical path leading a flux from a photographing lens to a photodetector for range finding with a reflecting means possessing photodetectors. CONSTITUTION:The title device is constituted such that a flux from the photographing lens 1 is transmitted from the semi-transparent part of a main mirror 2 and is reflected to a mirror box bottom part 10 by a submirror 7. The flux led to the mirror box bottom part 10 passes through a filter 8 correcting relative luminosity factor and a lens doubling as photometry and focus detection, and makes incident on a metering photodetector 20a provided on part of the reflecting means 20. About 80% of the light incident on the reflecting mirror 20 is reflected on an aluminum surface, and is led to the range finding optical system possessing a light detecting means 14 to obtain focus detection information regarding an object. Two light receiving devices can be efficiently arranged in the small space of the mirror box bottom. |
