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Thus,it can be prevented that objects other than the cartridge are incorrectly determined as cartridge entering.FIGS. 3A and 3B are a plan view and a perspective view showing a film cartridge insertion port according to a second embodiment of the present invention, including simple optical sensors L1 and L2, a bottom portion 1 of a camera body and a cover2 of a cartridge insertion port N. As sho
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