This Camera Focal Length Calculator Provides the Lens Focal Length By Using the Focal Length Formula.

Camera Lens 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 enables you decide which lens to use with your camera and/or image sensor. The calculator takes your target field of view (angle of view) and camera specification then provides the required lens EFL.

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 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.

A Lens Focal Length Calculator.
A Lens Focal Length Calculator.

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.

Find A CS Lens or M12 Lens for Your Project

Surveillance 1.1mm M12 Lens

1.1mm M12 Fisheye Lens
1.1mm M12 Fisheye Lens
200deg M12 Fisheye Lens
1.1mm M12 Fisheye Lens
$49.00

All-Sky 1.5mm M12 Lens

A miniature fisheye 1.5mm M12 lens for All-Sky cameras.
A miniature fisheye 1.5mm M12 lens for All-Sky cameras.
A 1.5mm S Mount RPi mini fisheye lens. The lens has an EFL of 1.5mm, F/# of 1.8, and a M12 Interface.
A fisheye 1.5mm M12 lens. The lens has an EFL of 1.5mm, F/# of 1.8, and a M12 S Mount Interface.
$49.00

Fisheye 1.9mm M12 Lens

200° M12 Fisheye Lens
200° M12 Fisheye Lens
200° Mini Fisheye Lens
Mini M12 Fisheye Lens
$49.00

Low Distortion 2.2mm M12 Lens

Low Distortion 2.2mm M12 Lens
Low Distortion 2.2mm M12 Lens
Low Distortion 2.2mm M12 Lens
Low Distortion 2.2mm M12 Lens
$39.00

GoPro 2.8mm M12 Lens

An M12 GoPro Fisheye Lens | 2.8mm M12 Lens
An M12 GoPro Fisheye Lens | 2.8mm M12 Lens
A miniature Rpi wide-angle Lens | A 2.8mm S-mount Lens
A GoPro Fisheye Lens for the Raspberry Pi | A 2.8mm M12 Lens
$39.00

Drone 2.8mm M12 Lens

A wide angle 2.8mm M12 lens no distortion.
A wide angle 2.8mm M12 lens no distortion.
A 2.8mm M12 lens with a wide angle and no distortion for the RPi HQ Camera.
A wide angle no distortion 2.8mm S Mount Lens.
$39.00

Conferencing 3.3mm M12 Lens

A 3.3mm M12 lens that is wide angle no distortion.
A 3.3mm M12 lens that is wide angle no distortion.
A 3.3mm S Mount lens for the Raspberry Pi High Quality Camera.
A 3.3mm wide angle no distortion M12 Lens.
$39.00

Conferencing 3.9mm M12 Lens

A 3.9mm M12 lens that is wide angle no distortion.
A 3.9mm M12 lens that is wide angle no distortion.
A 3.9mm M12 Lens pictured with the Raspberry Pi High Quality
A 4K M12 Lens for the Raspberry Pi High Quality Camera. CIL039.
$39.00

Fisheye 2.5mm CS Mount Lens

2.5mm Fisheye CS Mount Lens
2.5mm Fisheye CS Mount Lens
200° CS Mount Lens
2.5mm CS Mount Lens
$99.00

Wide-Angle 3.2mm CS Mount Lens

A 3.2mm CS Mount Lens for a Wide Lens Security Camera
A 3.2mm CS Mount Lens for a Wide Lens Security Camera
The CommonLands CIL03.2-F1.8-CSNOIR 3.2mm EFL lens is pictured with the Raspberry Pi HQ Camera.
The CommonLands CIL03.2-F1.8-CSNOIR 3.2mm EFL lens is pictured next to the Raspberry Pi HQ Camera.
$49.00

5.0mm CS Mount Lens for 12MP

A 5mm CS Mount Lens for CS Mount CCTV Cameras and the Raspberry Pi High Quality
A 5mm CS Mount Lens for CS Mount CCTV Cameras and the Raspberry Pi High Quality
The CommonLands CIL05.0-F2.0-CSNOIR is a 12MP+ wide angle 5.0mm F/2.0 CS-Mount Lens for 12MP+ CS Mount Cameras like the Raspberry Pi HQ.
The CommonLands CIL05.0-F2.0-CSNOIR is a 12MP+ wide angle 5.0mm F/2.0 CS-Mount Lens for 12MP+ CS Mount Cameras.
$49.00

Portrait 8.0mm CS Mount Lens

A 8mm CS Mount Lens for 12MP+ Cameras such as the Raspberry Pi HQ Camera.
A 8mm CS Mount Lens for 12MP+ Cameras such as the Raspberry Pi HQ Camera.
A 8mm CS lens is pictured with the Raspberry Pi HQ Camera.
An 8mm CCTV lens for 1/1.7
$49.00