Wondering How to Calculate Focal Length? This Camera Focal Length Calculator Provides the Lens Focal Length.
Lens Focal Length Calculator
This Camera Effective Focal Length Calculator enables you decide which lens to use with your camera and/or image sensor.
The calculator uses the uses the camera lens focal length equation. This formula is different than the lens maker's equation which is intended for simple thin lens elements.
The calculator takes your target field of view (angle of view) and camera specification then provides the optimal 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.
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