Photonics Buyers' Guide > Fixed Focal Length Lenses
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Fixed Focal Length Lenses

  • TERMS
  • focal length (f) The effective focal length (EFL) is the distance from the principal point to the focal point. The back focal length (BFL) is the distance from the vertex of the last lens to the second focal point. The front focal length (FFL) is the distance from...



   


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