| 摘要 |
PROBLEM TO BE SOLVED: To make a finder image bright and to reduce the loss of the light quantity of subject luminous flux guided to an exposure surface in a single-lens reflex camera constituted so that the finder image can be observed even in the midst of an exposure action. SOLUTION: In the mirror box MB of this single-lens reflex camera, a 1st half mirror 6 and a 2nd half mirror 8 are installed. The mirror 6 is constituted so that it can be turned with a turning shaft 6p as a center. When the exposure action is not executed, the mirrors 6 and 8 are positioned in the optical path of the luminous flux L transmitted through a photographing lens 2 and advanced toward a photographic film 14. The sufficient light quantity of object luminous flux is guided to a reticle 16. When the exposure action is executed, the mirror 6 and a sub-mirror unit 10 installed at the bottom part of the box MB are retreated outside the optical path. Since the transmissivity of the mirror 8 is set to be higher than reflectivity, the sufficient light quantity of luminous flux is guided to the exposure surface of the film 14.
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