---
title: "How do you back focus a camera fitted with a fixed focal length lens?"  
description: "How do you back focus a camera fitted with a fixed focal length lens?"  
author: "Mukul Goenka"  
published: 2022-05-24  
canonical: https://answers.mindstick.com/qa/97588/how-do-you-back-focus-a-camera-fitted-with-a-fixed-focal-length-lens  
category: "troubleshooting"  
tags: ["troubleshooting", "cctv camera"]  
reading_time: 1 minute  

---

# How do you back focus a camera fitted with a fixed focal length lens?

How do you back [focus](https://www.mindstick.com/blog/12314/how-to-improve-your-focus-at-work) a camera fitted with a fixed focal [length](https://www.mindstick.com/interview/1915/what-is-the-difference-between-char_length-and-length) lens?

## Answers

### Answer by Hitesh Vohra

This is accomplished in five simple steps:

- Set the lens's physical focus to infinity (clockwise from the front).\
- Aim the camera at the desired subject.
- Release the back focus mechanism on the camera.
- To get the best picture possible, adjust the back focus.
- Secure the back focus mechanism of the camera.

The 'focal flange length' is referred to as 'back focus.' This is the distance between the CCD and the back lens element.

A camera having a focus ring on the back. It will be found at the back of the lens housing. A rear focus chart, such as the one shown, is useful, but any object with high contrast will suffice.

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**Read More: [How do you connect an auto iris lens to a camera?](https://answers.mindstick.com/qa/97589/how-do-you-connect-an-auto-iris-lens-to-a-camera)**


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Original Source: https://answers.mindstick.com/qa/97588/how-do-you-back-focus-a-camera-fitted-with-a-fixed-focal-length-lens

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