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焦距

焦距，是光学系统中衡量光的聚集或发散的度量方式，指平行光入射时从透镜光心到光聚集之焦点的距离。

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朱导 Answered the question 2023-02-03 18:49 焦距: Q&A 焦距的作用是什么？

朱导: [焦距的用法]1.焦距越小，视野越宽焦距越大，视野越窄2.焦距越长，景深越小，背景越虚3.智能手机的1X以下为广角镜头 1X以上为长焦镜头; agree14 opposition 0 people thanks 0 comment 1 reply

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