This Camera EFL Calculator Provides the Lens Effective Focal Length From a Target Field of View.
Lens Focal Length Calculator
This Camera Effective Focal Length Calculator helps you decide which lens to use with your camera or image sensor. The calculator takes your target field of view (angle of view) and camera specification then provides the maximum lens EFL.
The Optical Effective Focal Length (EFL) should not be confused with the Mechanical Back-Focal Length (BFL). The EFL determines the field of view of the camera while the BFL determines whether a lens will focus on a camera.
The calculator uses a simple field of view equation and does not currently incorporate optical distortion.
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