| 摘要 |
PROBLEM TO BE SOLVED: To obtain a film unit with lens that constituted so a clear photographing action with proper exposure can be executed even in the case of the close-up photographing action using a stroboscope. SOLUTION: A photographing distance change-over switch 17 is switched by being sliding an operation member to the left and right according to the subject distance. The front upper end of a unit main body 3 is provided with a light quantity regulation plate 18. The plate 18 is movably fitted to a slide groove 19 formed at the front surface side of a stroboscopic light emission part 13. When the plate 18 is inserted in the front surface of the light emission part 13, stroboscopic light is attenuated when it is transmitted through the plate 18. Besides, when the diaphragm value of a photographing mechanism is defined as F and the ISO sensitivity of a photographic film is defined as (s), the guide number GN of the stroboscopic light is reduced to the range of 2M to 0.3×2N M=(((2 log2F)-(log2(s/100)))+3)/2 and N=(((2 log2F)-(log2(s/100)))-1.5)/2).
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