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

IR Corrected 4.4mm M12 Lens

CIL046-F2.0-M12A650

IR Corrected 4.4mm M12 Lens

Low Distortion 6mm M12 Lens

CIL059-F1.7-M12B650

Low Distortion 6mm M12 Lens

Wide-Angle 6.8mm M12 Lens

CIL368-F1.8-M12A650

Wide-Angle 6.8mm M12 Lens

Low Distortion 7.8mm M12 Lens

CIL078-F2.0-M12A650

Low Distortion 7.8mm M12 Lens

Telephoto 12mm M12 Lens

CIL125-F2.4-M12NIR

Telephoto 12mm M12 Lens

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

GMSL Camera 7mm F/1.8 M12 Lenses IP69K
GMSL Camera 7mm F/1.8 M12 Lenses IP69K
7mm Wide Angle S-Mount Lens Halcon Software
USB Camera Wide Angle M12 Lens Automotive Raspberry Pi
CIL368-F1.8-M12A650
Wide-Angle 6.8mm M12 Lens
$79.00
8mm M12 Lens CIL078 Nvidia Camera
8mm M12 Lens CIL078 Nvidia Camera
8mm M12 Lenses for Nvidia Camera
8mm S Mount Lens for Nvidia cameras
Low Distortion 7.8mm M12 Lens
CIL078-F2.0-M12A650
Low Distortion 7.8mm M12 Lens
$59.00
Telephoto 12mm M12 Lens
Telephoto 12mm M12 Lens
Telephoto M12 Lens 12mm
Arducam usb cameras Telephoto 12mm M12 Lens
Telephoto 12mm S-Mount Lens
CIL125-F2.4-M12NIR
Telephoto 12mm M12 Lens
$29.00
16mm M12 Lens CIL160 global shutter
16mm M12 Lens CIL160 global shutter
16mm M12 lenses CIL160 global shutter
16mm S Mount Lens global shutter
CIL160-F1.9-M12A650
Telephoto 16mm M12 Lens
$39.00
35mm M12 Lens
35mm M12 Lens
35mm Board Mount Lens
35mm S Mount Lens
CIL350-F2.4-M12A650
Telephoto 35mm M12 Lens
$59.00
3mm M12 Lens Low Distortion USB Camera
3mm M12 Lens Low Distortion USB Camera
3mm M12 Lenses AR0821 AR0820 CIL030 USB3 Camera
AR0820 Low distortion S Mount M12 Lenses USB3 Camera
CIL030-F2.1-M12A650
Low Distortion 3.0mm M12 Lens
$49.00

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

Wide-Angle 4.4mm M12 Lens

CIL344-F1.9-M12B660

Wide-Angle 4.4mm M12 Lens

188°@6.6mm IP67 M12 Fisheye

CIL222-F2.0-M12A650

188°@6.6mm IP67 M12 Fisheye

Mid-Range 7.6mm M12 Lens

CIL080-F1.8-M12IR

Mid-Range 7.6mm M12 Lens

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.

35mm C-Mount Lens 1.1" 20MP+

CIL545-F2.8-CMANIR

35mm C-Mount Lens 1.1" 20MP+

230°@4.5mm Fisheye M12 Lens

CIL213-F2.3-M12A660

230°@4.5mm Fisheye M12 Lens

Large Format 5.5mm M12 Lens

CIL056-F2.4-M12A650

Large Format 5.5mm M12 Lens

226°@3.9mm Fisheye M12 Lens

CIL212-F2.2-M12A660

226°@3.9mm Fisheye M12 Lens

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.

Telephoto 26mm M12 Lens

CIL260-F2.0-M12IR

Telephoto 26mm M12 Lens

Mid-Range 7.6mm M12 Lens

CIL080-F1.8-M12IR

Mid-Range 7.6mm M12 Lens

200°@5.7mm IP67 Fisheye M12 Lens

CIL217-F2.7-M12A650

200°@5.7mm IP67 Fisheye M12 Lens

Ingress Protected 7.9mm M12 Lens

CIL079-F2.0-M12A650

Ingress Protected 7.9mm M12 Lens

IP67 12mm M12 Lens

CIL120-F2.4-M12A650

IP67 12mm M12 Lens

Wide-Angle 4mm M12 Lens

CIL341-F2.0-M12A650

Wide-Angle 4mm 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.

Small 3.3mm M12 Lens

CIL036-F2.2-M12A650

Small 3.3mm M12 Lens

Telephoto 12mm M12 Lens

CIL125-F2.4-M12NIR

Telephoto 12mm M12 Lens

Telephoto 35mm M12 Lens

CIL350-F2.4-M12A650

Telephoto 35mm M12 Lens