等效焦距，是相机光电传感器芯片影像区域对角线的长度，等效成35mm照相机画幅对角线长度（42.27mm）时，其镜头的实际焦距所对应的35mm照相机镜头的焦距。
提出几种计算和测量激光棒负透镜等效焦距的方法。
The authors have reported two methods for measuring the efficient focal distance of the laser rod lenses.
导出透镜的等效焦距，主面、焦面位置以及高斯成象公式。
The formulas for determining the equivalent focal length, principal planes, focal planes as well as the GRIN lens law are derived.
如果exif头信息35毫米等效焦距可供一夹，相机焦距将被自动设置。
IF EXIF header information for a 35mm equivalent focal length is available for a clip, the camera focal length will be set automatically.
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