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关于佳能EF 75-300mm f⼀4-5.6 III USM

2025-03-15 13:31:50

推荐回答（1个）

回答1：

EF是佳能全画幅镜头卡口,75-300mm是焦长,也就是中焦75-长焦300的可调范围,数字越大望远能力越强,F/是指的光圈,4-5.6说的是在75端最大光圈可以达到4,而300端时最大光圈可以达到5.6,III是其75-300的第三代产品,USM是佳能镜头超声波马达的代号,用来快速对焦

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