| 摘要 |
PROBLEM TO BE SOLVED: To enable a photographer to easily confirm the luminance. SOLUTION: A recessed part 11 is formed on the top of a unit body 3, and a mark 13 showing that it is unnecessary to emit light is arranged on the bottom surface. The mark 13 is covered by an optical fiber 14 constituted of an ND filter. In a bright place such as in the daytime and under illumination, external light is thoroughly transmitted through the optical fiber 14. Thus, the photographer can view the mark 13, and the photographer can device that it is not necessary to use a stroboscopic device. In a dark place such as in the night or in a room, the external light is hardly transmitted through the optical fiber 14. Thus, the photographer can device that it is necessary to use the stroboscopic device.
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