| 摘要 |
PROBLEM TO BE SOLVED: To obtain a real image type finder optical system by which the harmful substance of dust or the like stuck on the surface of a lens is prevented from being observed and the excellent observation of a finder image is easily performed. SOLUTION: In this finder optical system by which an object image formed by a luminous flux passing through an objective optical system OL on a primary image formation surface IP is made an erect normal image through a condenser lens FL and an image inverting means P in order and the object image being the erect normal image is observed through the eyepiece E, when distance between the primary image formation surface IP and the condenser lens FL is defined as d(mm) and the focal distance of the eyepiece is defined as f(mm), the condition of 4<1000(mm)×d/f<2> is satisfied.
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