6SL3352-7AE32-1AA1

6SL3352-7AE32-1AA1

6SL3352-7AE32-1AA1

6SL3352-7AE32-1AA1

你能听到人们关于镜头谈论多的事情之一就是焦距。

什么是焦距？

如果你曾经好奇过什么是焦距，那可能已经在百度百科或类似的网站看到过如下的解释：“焦距，是光学系统中衡量光的聚集或发散的度量方式，指从透镜的光心到光聚集之焦点的距离。亦是照相机中，从镜片中心到底片或CCD等成像平面的距离。”

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