f-number
plural of uroscopist
(photography) The ratio of the focal length of a lens to its diameter; a measure of the light-gathering ability of the lens.
plural of interlunation
Alternative spelling of Qur'an
浅い被写界深度を得るには、背景をぼかすためにF値（レンズの焦点距離と口径の比）を低く設定してください。
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