| 摘要 |
PROBLEM TO BE SOLVED: To excellently compensate aberration and to obtain simple constitution equipped with an eyepiece optical system having high magnification and the high angle of visibility by making an optical path between an incident surface and a reflection surface consisting of one surface cross with an optical path between a roof surface and an emitting surface in a prism in a prism system for erecting an image. SOLUTION: Luminous flux emitted from the image-formation optical system of this camera is transmitted through the semi-transmissive film HM of a light splitting prism PS and split to a finder side. In the finder, the reflection surface M1 is arranged between the prism PS and a primary image-formation surface IM1 in a finder system. The prism PD for erecting the image and the eyepiece optical system E are arranged on and behind the surface IM1. This prism PD has the incident surface R1, the reflection surface R2 consisting of the plane, the reflection surface R3 consisting of the roof surface and the emitting surface R4. The optical path(optical axis AX3) between the incident surface R1 and the reflection surface R2 of the prism PD and the optical path(optical axis AX4) between the reflection surface R3 consisting of the roof surface and the emitting surface R4 of the prism PD are crossed with each other in the prism PD.
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