This Camera Calculator finds the Lens Focal Length From the Target Field of View

Camera Lens Effective Focal Length Calculator

A Camera Focal Length Calculator. This Calculates a Lens EFL for Cameras.
A Camera Focal Length Calculator. This Calculates a Lens EFL for Cameras.

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.

Read Our Camera Calculator & Optics Design Page, or Click below Use our Other Camera Calculators

Camera Field of View Calculator. FoV Calculator
Camera Depth of Field Calculator. DoF Calculator.
Camera Angle of View Calculator for Camera Lens Selection. AoV Calculator.

Here are a Few M12 Lenses. Search all 50+ Using Our M12 Lens Calculator

No Distortion 3.9mm M12 Lens

CIL039-F2.8-M12IR

No Distortion 3.9mm M12 Lens

F-theta Wide-Angle 4mm M12 Lens

CIL340-F2.0-M12A650

F-theta Wide-Angle 4mm M12 Lens

No Distortion 4.4mm M12 Lens

CIL043-F3.2-M12B650

No Distortion 4.4mm M12 Lens

Large Format 5.1mm M12 Lens

CIL050-F2.0-M12A650

Large Format 5.1mm M12 Lens

Mid-Range 7.6mm M12 Lens

CIL080-F1.8-M12IR

Mid-Range 7.6mm M12 Lens

We Also have Cost Effective 12MP+ C-Mount Lenses for Machine Vision and Factory Automation.

Wide Angle M12 Lens
Wide Angle M12 Lens
Wide Angle S-Mount Lens
AR0820 M12 Lens
CIL344-F1.9-M12B660
Wide-Angle 4.4mm M12 Lens
$49.00
A 7mm M12 Lens
A 7mm M12 Lens
7mm M12 Lenses
7mm S Mount Lens
CIL872-F2.8-M12A650
Low Distortion 7.2mm M12 Lens
$29.00
Stereographic M12 Lens
Stereographic M12 Lens
Stereographic M12 Lens
Stereographic M12 Lens
CIL825-F2.4-M12ANIR
Small 2.5mm M12 Lens
$39.00
2mm M12 Lens stereographic
2mm M12 Lens stereographic
2mm M12 Lenses stereographic
2mm M12 lens F2
CIL819-F2.0-M08A650
Small 1.9mm M8/M12 Lens
$39.00
6mm M12 Lens CIL056
6mm M12 Lens CIL056
6mm S Mount Lens
Econsystems See3Cam_CU8a
CIL056-F2.4-M12A650
Large Format 5.5mm M12 Lens
$39.00
IP67 12mm M12 Lens
IP67 12mm M12 Lens
IP67 12mm M12 Lens
IP67 12mm M12 Lens
CIL120-F2.4-M12A650
IP67 12mm M12 Lens
$39.00

What's Your Application? Our Lenses Cover the Spectrum.

Mobile Robotics?

Find a low F# or low distortion lens to optimize your computer vision.

Factory Machine Vision?

Our cost-effective compact C-Mount lenses are designed for up to 1.1"~1.2" format global shutter sensors.

Intelligent Everywhere?

Our low distortion lenses with multiple F# can be used to optimize your depth of field.

Surveillance?

Our fisheye and IR Corrected lenses are suitable for doorbell cameras and active IR illuminated scenes.

Low Distortion 6mm M12 Lens

CIL060-F2.8-M12A650

Low Distortion 6mm M12 Lens

215°@6.8mm M12 Fisheye Lens

CIL220-F2.3-M12B650

215°@6.8mm M12 Fisheye Lens

Wide-Angle 2.7mm M12 Lens

CIL327-F1.5-M12A660

Wide-Angle 2.7mm M12 Lens

190°@5.4mm Stereographic Fisheye M12 Lens

CIL293-F2.2-M12A650

190°@5.4mm Stereographic Fisheye M12 Lens

Does it Require Getting Dirty?

Our IP67 and IP69K lenses are suitable for applications exposed to the environment.

Aerial Robotics?

Our tiny lenses are ideal for collision avoidance and object recognition.

Low Distortion 3.0mm M12 Lens

CIL030-F2.1-M12A650

Low Distortion 3.0mm M12 Lens

IP67 12mm M12 Lens

CIL120-F2.4-M12A650

IP67 12mm M12 Lens

Wide-Angle 4.4mm M12 Lens

CIL343-F2.3-M12ANIR

Wide-Angle 4.4mm M12 Lens