| 摘要 |
PURPOSE:To provide a real image type finder optical system which has such a simple constitution that the number of the parts used in an optical system is minimized while the degree of freedom is increased at the time of incorporating a photometric element or photometric optical system in a camera, etc. CONSTITUTION:The real image type finder optical system is constituted of an object lens system 1 (5, 6, etc.), first prism 18a provided with a half-mirror surface 15 as an optical path splitting means, reflecting member composed of a second prism 18b which forms erect images of objects and is composed of a second prism 18b and third prism 18c, and eyepiece system composed of the exit surface of the prism 18b and a magnifying lens 14. In addition, a visual field mask 13 is provided between the prisms 18b and 18c and a photometry element 17 is provided at the position opposed to the exit surface 21 of the prism 18a in front of the surface 21. |
