Importance

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Abstract

A real image type finder optical system comprising, in order from the object side, an objective optical system of non-telecentric system, a first prism having a wedge angle of 3.degree., a second prism, a third prism, and an eyepiece lens. The second prism has a first face as the entrance surface in contact with the back surface of the first prism, a second face forming an angle of 22.5.degree. with respect to the first face and a third face for transmitting the optical axis bend by these second face and first face. The third prism has a first face as the entrance surface spaced in parallel from and confronting the third face of the second prism, a second face forming 45.degree. with respect to the first face in order to bend the optical axis toward the object side at an angle of 90.degree. within a horizontal plane, and a third face formed as roof faces for bending the optical axis bent by the second face toward the first face at an angle of 45.degree. within a horizontal plane. The eyepiece lens is arranged so as to confront the second face of the second prism and be coaxial with the optical axis which is bent by the third face and passes through the second face.

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First Claim