# Replacing an IR filter

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## Why Replace a Filter?

Filters in machine vision cameras play a crucial role in determining the wavelengths of light captured by the camera. Replacing or removing filters is often necessary in specialized scenarios, such as:

* **Using projectors** or **operating in a dark room**, where visible light interference must be minimized.

* Enhancing performance with an **infrared (IR) light source** (e.g., 850nm IR lights) to improve visibility in low-light or no-light environments.

Replacing the filter allows you to:

* Expand the camera's sensitivity to include both the **near-IR** and **visible spectrum**.

* Focus on capturing **near-IR wavelengths** by blocking visible light with an IR pass filter.

## Step-by-Step Filter Replacement Process

<YouTube id="H21uTVAupBE" title="AR 51 — Replacing a Camera IR Filter" />

### Remove the Lens 

Unscrew and safely remove the lens from the camera to expose the filter or sensor housing.

### Access the Camera’s Outer Shell

Unscrew and carefully remove the outer casing of the camera. Keep the screws in a secure place to avoid losing them.

![Replacing an IR filter — Unscrew the camera case](./img/replace_camera_filter/1.unscrew_the_camera_case.png)

### Remove the Existing Filter

Most color cameras come with a pre-installed *IR filter* that blocks infrared light while allowing visible light through.

![Replacing an IR filter — Remove the IR filter](./img/replace_camera_filter/2.remove_the_IR_filter.png)

Gently detach this filter if you want the camera to capture both *near-IR* and *visible light*

:::warning
**Important**: Be careful not to touch the camera sensor with your finger. The oils from your skin can leave a smudge on the sensor or filter, reducing the quality of the images captured by the camera.

:::

### Install a New Filter (if required)

To block visible light and capture only **near-IR wavelengths**, install a **near-IR pass filter** in place of the existing IR filter. Ensure the filter is securely positioned over the sensor.

### Reassemble the Camera

* Carefully replace the camera’s outer shell and secure it by tightening the screws.

* Reattach the lens by screwing it back into place.

![Replacing an IR filter — Reassemble the Camera](./img/replace_camera_filter/3.Reassemble_the_Camera.png)

## Additional Tips

* **Ensure Compatibility**: Check that the new filter is compatible with your camera model. Incorrect filters may cause vignetting or performance issues.

* **Use Appropriate Tools**: Handle the camera and its components with tools designed for precision electronics to avoid damage.

* **Test the Camera Setup**: After replacing the filter, test the camera with your IR light source to confirm proper functionality. Adjust focus and other settings as needed.

## Summary

By following this guide, you can successfully modify your machine vision camera to suit specific lighting and operational requirements.