| 摘要 |
Reduction lens (20) is arranged between imaging lens (11) and film (16) with its optical axis coaxial to optical axis of imaging lens. Flat divider mirror (21) separates light from reduction lens, from optical beam path to film. Reduction lens brings level (F) equivalent to film level, nearer to imaging lens so area, from which light from focus detection unit (30) is taken, is enlarged without increase in size of optical elements. Reduction lens (20) is arranged between imaging lens (11) and film (16) with its optical axis coaxial to optical axis of imaging lens. Flat divider mirror (21) separates light, accessing from reduction lens, from the optical beam path to the film. Reduction lens bring level (F) equivalent to film level, nearer to the imaging lens so the area, from which light from the focusing detection unit (30) is taken, is enlarged without increase in size of the unit optical elements. Reduction lens has positive converging power so that exit pupil of imaging lens (11) is optically conjugated to inlet pupil of divider lenses (32,33) so lenses 932,33) provide secondary images on flat sensors (35,36). Flat sensors output to microcomputer (38) which determines focus detection of imaging lens (11) with respect to object and then controls focus mechanism (39) to adjust lenses of imaging optics (11).
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