| 摘要 |
PURPOSE:To provide the automatic focusing optical system construction for a camera which is simple and mechanically reliable. CONSTITUTION:A finder mirror 20 is disposed on the optical path of an image from an object, and a first prism 30 is disposed above the finder mirror 20. The one surface of the first prism 30 is a half mirror surface 30c. An AF glass block 35 is brought into contact with the half mirror surface 30c, an AF device 36 is disposed on the open end surface of the AF glass block 35, the light of the object which is made incident on the finder optical system is transmitted through the half mirror surface 30c and the AF glass block 35, and is made incident on the AF device 36, and is served to obtain range-finding information. |
