| 摘要 |
PROBLEM TO BE SOLVED: To provide a compact real image type variable power finder capable of realizing the excellent observation of a finder image in all the variable power range in spite of being a wide angle and high variable power. SOLUTION: In the real image type finder optical system for observing an object image formed by an objective optical system having positive refractive power by an eyepiece optical system, the objective optical system is provided with a 1st negative group, a 2nd negative group, a 3rd positive group, and a 4th negative group is order from an object side. In the case of varying power from a wide angle end to a telephoto end, at least the 2nd group is moved, the 3rd group is moved to the object side, and the 4th group is moved so that a distance between the 3rd group and the 4th group can be changed. COPYRIGHT: (C)2004,JPO
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