---
title: "Adjust camera lens focus with front focus ring"
canonical: "https://help.vicon.com/space/Valkyrie/1770312/Adjust%20camera%20lens%20focus%20with%20front%20focus%20ring"
format: markdown
---
You can sharpen the camera lens focus by adjusting the focus ring on the camera lens

![image](media://85b073df-4ea3-483c-a25b-2ec568c55f92)

You can see the results while you are focusing the camera by viewing the marker images in your Vicon application software, in a **Camera** view pane. The following procedure briefly describes how to view the live camera data in your Vicon application software. For full details of the software steps, see the documentation for your Vicon application software.


**To adjust camera lens focus with the front focus ring:**


1. Hold the camera body (not the lens), and carefully unclip the IP65 lens cover from the lens. (You may find it easiest to unclip one side of the cover first, and then ease off the cover from the other side.)
2. Mount the camera on a tripod within reach of the Vicon Valkyrie host PC on which the Vicon application software is installed.
3. Ensure that you can view the camera data from the Vicon application software on the Vicon Valkyrie host PC. For details on doing this, see the documentation for your Vicon application software.
4. Place a selection of markers of the type you will use during motion capture central to the camera Field of View and at a distance from the camera representative of the capture distance, for example, some in the middle of the capture volume and some at a greater distance from the camera.
5. Ensure that the lens aperture is at its most open setting, that is, it is set to the lowest numerical value on the aperture ring.  
This lets more light into the camera and minimizes the depth of field (for details, see [Aperture and depth of field](https://vicon-help.atlassian.net/wiki/spaces/Valkyrie/pages/1765705/Vicon+Valkyrie+camera+lens)).
6. In the Vicon software, check the marker images from this camera (for details, see the documentation for your Vicon application software), ensuring that you achieve the best balance between the near and far markers.
7. In the Vicon software, observe the sharpness of the image of the markers; slowly adjust the front focus ring of the camera lens until the markers appear in sharp focus in the software, as shown in the following illustration.
8. In the Vicon software, zoom out and check that other markers of interest distributed around the volume are also in focus.
9. When focusing is complete, to ensure the focus stays at the desired level, with your fingers tighten the locking screws that lock the focus ring and aperture.
  :warning:** Caution**: If the locking screws are not sufficiently tightened, the weight of the lens can cause the rings to move. Ensure the locking screws are finger tight, but to avoid damaging the screws or the rings, do not over-tighten the locking screws and do not use an Allen key.
10. Carefully replace the IP65 lens cover back onto the lens, ensuring that it's fully clipped into place. To do this:
  1. Hook one side of the clips on the cover, then rotate the other side on, with your thumb overhanging the clip area for extra leverage.
  2. Supporting the underside of the lens, push firmly downward over the clip until it clicks into place.
  3. Check both clips are in place and the cover is correctly positioned over the lens.
    :warning:** Caution**: To ensure the lens remains free from dirt and other contaminants and that the camera remains IP65-rated, keep the lens cover in position over the lens after installation.
11. Return the Vicon software to the default capture settings (for details, see the documentation for your Vicon application software).

> ❌ **Caution**   
> ❌ If the lens cover and IP65 cable cap are not fitted or are incorrectly fitted, the Valkyrie camera ceases to be IP65-rated. To maintain IP65 protection for your Vicon Valkyrie cameras, ensure that if you remove IP65 cable caps (and/or lens covers), you replace them correctly, as described in [Remove and replace IP65 cable cap](https://vicon-help.atlassian.net/wiki/spaces/Valkyrie/pages/1756311) in the *Vicon Valkyrie Quick Start Guide*.