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单词
flash factor
释义
flash factor
flash factor
[
′flash ‚fak·tər
]
(optics)
In photography using a photoflash lamp, a number dependent on the lamp and the film speed, equal to the product of the distance of the lamp from the subject and the correct
f
-number for that distance.
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更新时间:2025/6/4 18:02:26