以上来源于: WordNet
N any of the settings for the f-number of a camera 相机的光圈数刻度
Aperture sizes are expressed in "f-stops."
光圈的大小用“f”来代表。
All of this is a lot to remember. Juggling f-stops, shutter speeds, and ISO values in your head while trying to compose a shot can be tough, especially for beginners.
太多参数需要记住，尤其对于初学者来说，相反的f值，快门速度，以及IS O值，在准备拍摄一张照片的时候这些参数实在太过复杂。
Just like with f-stops, there is a mathematical relationship between different shutter speeds-each shutter speed stays open half as long as the one above it, or twice as long the one below it.
就和f值一样，这一组数字也是一个数列关系，每一档快门速度都是比上一档快一倍的时间，或者是慢一半的时间。
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