optimum aperture

基本解释

Aperture used and consequent depth of field as well as use of optimum aperture.
所用的光圈以及其相應景深；是否使用了最佳光圈；
Optimum position of sprinkling aperture and formula of rotating speed are derived.
推導出了最佳開孔位置和轉速的計算式。
Of course using such film means ISO speeds of under 100, which means that a tripod, cable release and mirror lock-up are a necessity when combined with the use of the lens' optimum aperture.
儅使用最佳光圈時，你還應該同時使用ISO100或者更低速的膠卷（如ISO50的FUJI VELVIA - 譯者注），相機的反光板鎖定功能，三角架，以及快門線。