• 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.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毫米等效焦距可供一夹，相机焦距将被自动设置。
  dict.yoduao.com

©2026 网易公司