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50 mm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.
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