| 摘要 |
A finder optical system for a single-lens reflex camera has an eyepiece comprising in order from the viewing end thereof a negative lens consisting of a single negative lens or of a composite lens comprised of a positive lens and a negative lens, and a positive lens group consisting of two or more lens subgroups one of which constitutes a composite lens formed of a positive lens and a negative lens, wherein the overall length L and the focal length f of the eyepiece satisfy the relationship 0.65<f/L<0.9. The finder optical system is suitable for use in a single-lens reflex camera having a small picture size since it enables the focal length of the eyepiece to be kept short and the image magnification high even in the case where the overall length of the eyepiece is great.
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