| 摘要 |
PURPOSE:To perform highly accurate focusing detection without enlarging the camera body by letting an eyepiece lens also make lens action in the direction orthogonal to the optical axis for observation. CONSTITUTION:The image of the subject formed by a photographic lens 22, quick return mirror 25, condenser lens 26 is observed through a pentagonal prism 27 and the eyepiece lens 28 of the optical axis 01. This lens 28 is also given lens action even for the optical axis 02 in the direction orthogonal to the optical axis 01 and the imaging light is received in a photo detection part 32 by a half mirror 29 provided with a lens 26, a total reflecting mirror 30, a lens 28 and a total reflecting mirror 31, whereby the focusing is detected. Hence, the focusing detection may be performed highly accurately without enlarging the camera body by the focusing detecting optical path of the long optical path in the same vertical direction of the observation optical path. |
