This Camera Calculator finds the Lens Focal Length From the Target Field of View
Camera Lens Effective Focal Length Calculator
This effective focal length calculator helps you select a lens to use with your camera. The calculator takes your target field of view (angle of view) and camera specification then provides the required lens EFL.
The calculator 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 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.
What's Your Application? Our Lenses Cover the Spectrum.
Factory Machine Vision?
Our cost-effective compact C-Mount lenses are designed for up to 1.1"~1.2" format global shutter sensors.
Our low distortion lenses with multiple F# can be used to optimize your depth of field.
Our fisheye and IR Corrected lenses are suitable for doorbell cameras and active IR illuminated scenes.
Does it Require Getting Dirty?
Our IP67 and IP69K lenses are suitable for applications exposed to the environment.