Unverified90% confidenceTradeoffTime unknown

APS-C画幅在等效焦距上有约1.5倍（佳能1.6倍）裁切系数，打鸟/生态摄影用200mm镜头即可获得全幅300mm视角，反而比全幅更省钱省重量

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UnverifiedAPS-C画幅机身搭配全画幅长焦有等效焦距加成（1.5-1.6倍），400mm镜头等效600mm，打鸟反而更划算；但全副长焦装在半幅机上体积重量不缩小92% similar UnverifiedAPS-C画幅相机选定焦需按1.5倍(佳能1.6倍)换算等效焦距：即23mm约等于全画幅35mm、35mm约等于全画幅50mm，直接买35mm挂在APS-C上会偏长86% similar

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