“F-number drift zoom lens”的概念、定义、翻译、参考文献-科学参考

单词	F-number drift zoom lens
释义	F-number drift zoom lens Encyclopedia 艺术学镜头参数释 F-number drift zoom lensF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。
随便看	derivative of a distribution derivative of a function derivative of a generalized function derivative of a mapping derivative of an element derivative of a polynomial derivative of a vector derivative of higher order derivative of holomorphic mapping derivative of order n derivative on the left derivative on the right derivative operator derivative rule derivatives derivatives along a direction derivative set derivatives market statistics derivatives of higher orders derivatives of rubber derivative spectrophotometry derivative spectrum derivative synchronous fluorescence spectrometry derivative test derivative words

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