夜间摄影与白天摄影受到同样条件的约束——即光圈，快门速度，感光度——不过它对于这些参数的控制都要达到极致。
Night photography is subject to the same set of constraints as daylight photography - namely aperture, shutter speed and light sensitivity - although these are all often pushed to their extremes.
远摄镜头的性能加上f/2.8的光圈，再加上最长500mm的长焦端，使该镜头适合拍摄野生动物和体育赛事，也是天文爱好者进行天文摄影的绝佳镜头。
The combination of telephoto capabilities and an f/2.8 aperture throughout the zoom range up to 500mm makes this a great lens for wildlife, sports and for you stargazers, astrophotography.
面向初级和中级水平的摄影师，《理解曝光》用简单易懂的文字介绍了光圈、进光量和快门速度这“摄影三角”的基本知识。
Easy to read and straight-forward, Understanding Exposure offers the basics of aperture, lighting and shutter speed, photography’s basic triumvirate, to beginning and intermediate photographers.
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