| 摘要 |
PURPOSE:To generate the photometric information corresponding to an eyepiece by so constituting a pentagonal prism that the entire region light of the visual field frame enters a photometric element and so constituting the same that the reflecting face performs required light attenuation. CONSTITUTION:If the front reflecting face C and front triangle face E of a pentagonal prism 2 are made large and small, the incident light of the entire region of a visual field frame 1 through the taking lens enters not only the eyepiece 3 but photo detector 4 as well. If a reflecting film M forming a saw-tooth-form circumferential edge on the face C, etc., the reflected light enters the element 4 by becoming less as it goes further from the incident light to the lens 4, thus the effect of the incident light upon the portion of the frame 1 is eased and corrected and the proper distribution of the quantity of light is obtained. The photometric information of a correct quantity in correspondence to the eyepiece may be obtained and the photographing of correct exposure done. |
