| 摘要 |
PROBLEM TO BE SOLVED: To make adequately photographable even a main subject at a relatively long distance with electronic flash light. SOLUTION: A film unit with a lens is equipped with an electronic flash unit which emits light by a constant quantity. Its mode is switched to a normal mode, a normal electronic flash mode, or a power-up mode interlockingly with the operation of an operation member 7. In the normal mode, a normal stop aperture is set and the electronic flash is inhibited from emitting light. In the normal electronic flash mode, a normal stop aperture is set and the electronic flash emits light. In the power-up mode, a stop aperture which is larger than the normal stop aperture is set and the electronic flash emits light. The T number of a photographic lens is set to T1 when the normal stop aperture is used and T2 when the large stop aperture is used, the film sensitivity of a photographic film to S, the guide number of the electronic flash to GN for film sensitivity ISO100, and the upper limit of a photography distance to a main subject to 3.1 m in the normal electronic flash mode and 6.2 m in the power-up mode. |
