| 摘要 |
<p>PURPOSE:To effectively utilize the ineffective part of the luminous flux of a finder and to increase the light quantity of photometry by installing a condensing lens, a part of which is notched on an optical axis side, at the back of a pentagonal roof prism and close to the optical axis of the finder. CONSTITUTION:The condensing lens 6 and a light receiving means 7 are arranged at the back of the projectile surface of the pentagonal roof prism 4 and the luminous flux reflected on a QR mirror 2 forms an image on a focusing plate 3, and then condensed by the lens 6 so as to execute photometry by the light receiving means 7. In such a case, a part of the condensing lens 6, on the side of the optical axis 10 of the finder, is notched and it is arranged close to the optical axis 10 of the finder. Thus, the diameter of the condensing lens can be made larger than a conventional one and also the luminous flux of the ineffective part of the luminous flux of the finder can be effectively utilized to increase the light quantity of photometry by making said lens 6 close to the optical axis 10. As a result, the precision of photometry to the object of low luminance can be made excellent.</p> |
