Finder optical system for a single-lens reflex camera
AssigneeOlympus Optical Co., Ltd.
InventorToshihide Nozawa
Life of this patent
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Abstract
A finder optical system for a single-lens reflex camera comprising a pentagonal roof prism, and an eyepiece which comprises a negative lens and a positive lens and which is arranged on the light exiting side of the pentagonal roof prism, the finder optical system being arranged that an aspherical surface is adopted for the surface on the image side of the negative lens so as to thereby arrange that, even when a small-sized pentagonal roof prism is used, a satisfactorily long eye relief is ensured the magnification of the finder is not decreased and, at the same time, aberrations are corrected favorably.
Claims6
A finder optical system for a single-lens reflex camera comprising a pentagonal roof prism and an eyepiece comprising a negative lens and a positive lens and arranged on the light exiting side of said pentagonal roof prism, the surface on the image side of said negative lens being arranged as an aspherical surface.
Dependencies are inferred from the claim text.