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批踢踢實業坊 DSLR 板
 
Re: [問題] Crop factor與"等效"光圈大小的關聯性
Apr 15th 2015, 00:26, by ap521125 

大家都有玩過單槍投影機吧？

你可以把投影布幕想成相機的片幅，固定投影機的位置就是鏡頭了

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