| 摘要 |
A zoom finder is provided which includes an objective optical system of a positive power having a first lens group of negative power, a second lens group of positive power, a third lens group of positive power, and an eye piece optical system of a positive power through which an image formed by the objective optical system is observed. The first lens group, the second lens group, the third lens group and the eye piece object system are arranged in this order from an object side. The second lens group of the objective optical system is movable in an optical axis direction to vary the power, and the first and second lens groups are movable in association with each other to keep a constant diopter.
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