只买机身，然后另外购买一个高速镜头.（译者：一般指允许进光更多而提高快门速度的，大光圈镜头。
它的大光圈镜头可以摄入尽可能大的光量，所用技术并不需要笨重的自动对焦系统，曝光时间也是自动调节。
It has a wide-aperture lens to capture as much light as possible, and the technology requires no clunky auto-focus mechanism. It adjusts exposure time automatically.
然而像我们这些单反相机的使用者在有足够多的经验之前，总是很难理解一个大光圈的50mm镜头是多么的实用。
What some of us DSLR users don't realize until we've grown enough is just how wondrous and useful a good 50mm lens with a wide aperture is.
普兰那结构式霰弹许多卡尔·蔡司高素质镜头的基础，有着高色差纠正、大光圈、像场平和低色散的优势。
The Planar is the foundation for a variety of Carl Zeiss high-performance lenses with impressive color correction, speed, image flatness and low image distortion.
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。
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.
大多数镜头的最佳光圈是从它大光圈调细约三。
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。
Most lenses are at its best when stopped down by about three stops from their maximum aperture;
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