| 摘要 |
PROBLEM TO BE SOLVED: To obtain an excellent live viewing image with less lowering of surrounding illuminance, by optimizing a live viewing optical system for leading a light reflected by a reflecting face of a part of a penta daha mirror to a live viewing imaging device. SOLUTION: The live viewing optical system A is arranged between an opening portion G of the penta daha mirror and the live viewing imaging device and re-images the light reflected by a part of the reflecting face on the live viewing imaging device. A position of an incidence pupil K meets a following conditional formula (1). (1) 0.75<((Dp/2-Y)×Za)/((Ra/√2-Y)×Zp), wherein Dp: an incidence pupil diameter of the live viewing optical system, Zp: a distance from a focal plate to the incidence pupil of the live viewing optical system, Y: the maximum image height on the focal plate, Za: a distance from the focal plate to the opening portion of the penta daha mirror, Ra: a distance from an optical axis of the live viewing optical system to a daha ridge line. COPYRIGHT: (C)2009,JPO&INPIT
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