N-COUNT
（照相機的）光圈，孔徑
In photography, the aperture of a camera is the size of the hole through which light passes to reach the film.
例句
Use a small aperture and position the camera carefully...
用小光圈，仔細(xì)調(diào)整相機位置。
The camera has a 32mm lens with a maximum aperture of f/4.5 and a fixed shutter speed of 1/100sec.
這架相機有一個32毫米的鏡頭，最大孔徑為f/4.5，固定快門速度為1/100秒。