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F-number drift zoom lens
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F-number drift zoom lens
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镜头参数
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F-number drift zoom lens
F数漂移式变焦距镜头
当摄影镜头焦距f'改变时,该摄影镜头的入瞳直径Dλ虽也跟着产生改变,但变化的倍率小于焦距f'的改变,即f'与Dλ二者的比值在变焦中改变了,从而使该摄影镜头的F数在变焦的全过程中产生变化的变焦距摄影镜头。
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