全画幅数码相机上50mm的镜头,运用在APS尺寸上,镜头的等效焦距大约等于:()

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全画幅数码相机上50mm的镜头,运用在APS尺寸上,镜头的等效焦距大约等于:()

A.50mm

B.75mm

C.150mm

D.100mm

参考答案:

答案:75mm