只有配用1.5x或1.6x镜头焦距转换率的镜头，方能获得正常的广角效果，不过也不必担心什么，这些镜头已经随处可见，并且比起全画幅的要便宜不少。
With a crop factor of 1.5x or 1.6x you need special digital lenses to get true wideangle results, but these are readily available and are usually less expensive than their 'full frame' counterparts.
我们采用广角喷嘴制成的喷雾冷却装置应用于冷却塔中，取得了较好的效果。
The spraying cooling designs, made up with wide spraying nozzles, was used in this new kind of cooling tower and got a better effect.
对于望远镜头来说这木有问题，但是用超广角镜头时，所涵盖的部分极化效果差异巨大。
This is no issue with a tele lens, however with a super wide you are sweeping such a broad expanse that the polarizing effect will vary greatly across the sky.
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