Most lenses are at its best when stopped down by about three stops from their maximum aperture;
大多数镜头的最佳光圈是从它大光圈调细约三。
Even if you intend to expose using a small aperture, a lens with a large maximum aperture can greatly increase viewfinder brightness.
即便你打算使用小光圈照相，带有最大光圈的镜头也可以在取景时大大增加取景器亮度。
This is a technique called Maximum Aperture, and is done by adjusting the Settings on your digital camera to let more light pass through the lens.
这种技巧称为“最大光圈”，通过调整数码相机设置，让更多光线进入镜头，便可完成。
Camera lens should be set to infinity with maximum aperture. then point the camera to perseus or neighbour constellations for a5-minute exposure time and try your luck.
将镜头对焦至无限远，对准英仙座或其邻近星座，把光圈调至最大，曝光5分钟，应有收获。
To obtain the greatest flash range possible for far-off subjects, he shoots at or near maximum aperture and at a high light sensitivity, either ISO 400 or more rarely 800.
获得为远方的主题可能的最大的闪光范围，他在最大的孔上或附近和在高的光敏性，ISO 400或者更很少800射击。
When you mount a lens (whether the camera is on or off), the camera interrogates the lens for its characteristics, including maximum aperture, which one of the focusing parameters.
装上镜头后(不论相机是开着还是关闭的)，相机便会获知镜头特征，包括最大光圈，哪一组对焦参数等。
For example, the maximum power on a 60mm telescope (2.4 "aperture) is 142x."
比如，孔径为60mm(即2.4英寸孔径)的望远镜最大放大率为142x。
This will only apply to those using full cameras, but using the widest aperture available to you will ensure the maximum level of light, allowing the majority of focus on the foreground.
这只适用于那些使用全功能相机的人，但是尽可能的使用最大光圈能够确保最大亮度，来让焦点尽量聚焦在前景上。
The selected lenses all have different maximum effective aperture and image magnification.
这些镜头都有不同的有效光圈值及放大率。
Because maximum field of view in telecentric systems directly relates to the lens aperture closest to the object, larger front lenses are necessary for larger fields of view.
由于在远心系统中最大视场直接关系到镜头的镜头的光圈到物体之间的距离，若需要大的视场就必须要有大尺寸的前置镜头。
Three key parameters, namely beamwidth, directivity and maximum sidelobe level, are drawn versus the distance between field points and the center of aperture.
采用口径场绕射积分求取了天线的近场及远场方向图，绘制了波束宽度、方向性和最大副瓣电平三个关键参数随场点距离的关系曲线。
Three key parameters, namely beamwidth, directivity and maximum sidelobe level, are drawn versus the distance between field points and the center of aperture.
采用口径场绕射积分求取了天线的近场及远场方向图，绘制了波束宽度、方向性和最大副瓣电平三个关键参数随场点距离的关系曲线。
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