• 1. equivalent focal length: 等效焦距 | 等值焦距 | 等效通量密度
• 2. EF Equivalent Focal Length: 等效焦距
• 3. equivalent eccentric focal length: 等效焦距

• 1.The formulas for determining the equivalent focal length, principal planes, focal planes as well as the GRIN lens law are derived.
  导出透镜的等效焦距，主面、焦面位置以及高斯成象公式。
  dict.yoduao.com
• 2.IF EXIF header information for a 35mm equivalent focal length is available for a clip, the camera focal length will be set automatically.
  如果exif头信息35毫米等效焦距在某一段上是有效的，相机焦距将被自动设置。
  dict.yoduao.com
• 3.Starting from the ray path equation, object-image relationships are found and used to determine the equivalent focal length and the principal planes of tapered GRIN fiber.
  本文从光线轨迹方程出发，推导了锥形梯度折射率纤维的物像关系式，并得出了它的等效焦距和主平面位置。
  dict.yoduao.com

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