The system aperture, often the entrance pupil or the aperture stop, limits the rays that can enter the optical system from the defined field.
系统孔径，常指入瞳 （entrance pupil）或孔径光 （aperture stop），它限制可从已定义视场入射光学系统的光线。
The results show that the dynamic spatial resolution in time direction has been improved by 15-20% when the aperture stop width is properly enlarged.
分析结果证明，在适当扩大孔径光栏宽度后，在时间方向上的动态空间分辨率可提高15～20％。
Usually one can first meter using a larger aperture (so that the metered exposure time is under 30 seconds), then stop down as necessary and multiply the exposure time accordingly.
通常，你可以用大点的光圈测光(这样，测量的曝光时间就在30秒以内)，随后缩小光圈，相应地增加曝光时间。
The f-stop, otherwise known as the aperture, determines your depth of field (the area in focus) and how much light can pass through the lens to reach the sensor.
f制光圈(或称光圈)决定相机的景深(对焦区域)以及有多少光能通过镜头到达传感器。
Each aperture size (referred to as a stop) is marked with a corresponding number that represents half the light of the previous stop.
每一档数字都是比前档减少一半的通孔大小。
Because this is all manual, if you set anything other than the widest aperture on your lens it will stop down and the image on the screen will darken.
因为这是一切手动，如果你设置什么比你的镜头上停止下来，它会在屏幕上的图像将变暗，最宽光圈值等。
The aperture ring is just taut enough and incredibly smooth, and obviously because they are designed for motion film and video, it is click-stop free.
光圈环结合紧密却又难以置信的顺滑，显然是专为电影拍摄设计的。
The aperture ring is just taut enough and incredibly smooth, and obviously because they are designed for motion film and video, it is click-stop free.
光圈环结合紧密却又难以置信的顺滑，显然是专为电影拍摄设计的。
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