| 摘要 |
PROBLEM TO BE SOLVED: To independently operate a diaphragm and a stroboscope by providing a biasing means for biasing a diaphragm switching means so that a 1st diaphragm is positioned on the optical axis of a photographing lens. SOLUTION: A tension spring 33 is laid at the left part of a diaphragm plate 31 and the plate 31 is biased leftward. If the plate 31 does not touch a diaphragm switching operation member 13, the right end of a slot 31d abuts on a guide pin 32 and the center of a large diaphragm 31a is aligned with the optical axis O of a photographing lens L. The film unit is equipped with a fixed diaphragm plate 34 and the aperture of a fixed diaphragm 34a provided on the optical axis O is larger than the large diaphragm 31a. Next, the member 13 is operated to slide the plate 31 rightward against the spring 33. Then, the center of a small diaphragm 31b is aligned with the optical axis O of the lens L. By releasing a hand from the member 13, the plate 31 is moved leftward by the spring 33 and the center of the diaphragm 31a is aligned with the optical axis O of the lens L.
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