Superseded90% confidenceFactTime unknown
APS-C画幅相较全画幅有约1.5x（尼康/索尼）或1.6x（佳能）的焦距等效倍率，同一支300mm镜头在APS-C上等效约450-480mm，打鸟/长焦题材反而是优势
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This knowledge claim has been superseded by newer content
APS-C传感器的等效焦距转换系数：佳能为1.6x，索尼/富士/尼康为1.5x，选镜头时需将标称焦距乘以系数换算实际视角，如50mm在索尼APS-C上等效75mmSources
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