| 摘要 |
A focusing optical system for single-lens reflex cameras comprising a semi-transparent mirror, lens and reflecting mirror, which are arranged near an exit surface of a penta-prism, and a detector arranged near an external surface of the penta-prism, the focusing optical system for single-lens reflex cameras being arranged to reflect a part of light from the penta-prism by the semi-transparent mirror, to further reflect that light by the reflecting mirror after it passes through the lens and to detect that light by the detector after it passes through the lens again.
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