| 摘要 |
A real image finder includes an objective optical system which forms an image of an object to be viewed on a primary image forming surface, a viewing optical system which is adapted to view the object image formed on the primary image forming surface, and an image erection optical system having four reflection surfaces. The optical axis of the objective optical system is aligned parallel with the optical axis of an ocular optical system. Two of the four reflection surfaces of the image erection optical system are located before the primary image forming surface and the remaining two reflection surfaces are located after the primary image forming surface. The first two reflection surfaces are defined by mirrors and the latter two reflection surfaces are defined by a prism.
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