| 摘要 |
A real image mode variable magnification finder has an objective optical system with positive refracting power, an image erecting optical system, and an ocular optical system with positive refracting power. The objective optical system has a first lens unit with negative refracting power, a second lens unit with negative refracting power, a third lens unit with positive refracting power, and a fourth lens unit with negative refracting power. When the magnification of the finder is changed, a plurality of lens units including the third lens unit are moved. In this way, the total length of the objective optical system can be reduced, and thus a compact finder is obtained.
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