---
title: "Calibrate cameras"
canonical: "https://help.vicon.com/space/ShogunMarkerless121/1253507088/Calibrate%20cameras"
format: markdown
---
To start a capture, you must first calibrate your cameras. To calibrate your Vicon cameras, complete the procedures listed in this section in the following order.

> Macro (children)

> Macro (scroll-pagebreak)

To help you complete the calibration, the sections in the Camera Calibration panel are in the order in which you calibrate your cameras.

> ![Camera Calibration panel in Vicon Shogun Markerless, showing sections in order of use.](media://d772699c-4d6a-4bd2-a2fe-9caf185dd13d)

When you first connect up your Vicon system and start Vicon Shogun Markerless, notice that in both the **System** panel and in the **Cameras** view, icons give you feedback on the current status of the cameras. The cyan icons indicate that although the cameras are connected, they are not yet calibrated.

> ![Icon indicating uncalibrated camera in System panel and Cameras view in Vicon Shogun Markerless.](media://1a6327b4-caa4-4afd-8c4a-1108435899dd)

> ✅ ** Tip**   
> ✅ To make it easy to tell when cameras have been disconnected, camera views for disconnected cameras display a red border.

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To avoid having to recalibrate the whole system when you make changes such as adding or moving some of the cameras, you can [Calibrate or recalibrate selected cameras](https://vicon-help.atlassian.net/wiki/spaces/ShogunMarkerless121/pages/1253507110).

> ⚠️ **IMPORTANT: Avoid running Shogun Markerless overnight**  
> ⚠️ To maintain the lifespan of the system GPUs, do not leave Shogun Markerless running overnight.


> ⚠️ **IMPORTANT: Systems that include optical cameras**  
> ⚠️ Before you begin camera calibration, ensure that:
> ⚠️ 
> ⚠️ ▪️ Optical cameras have fully warmed up to a stable operating temperature. Vicon recommends a minimum 30–60 minute warm-up period. To ensure strobe activity, which can accelerate the warm-up period, connect up the Vicon system and run Vicon Shogun Markerless.
> ⚠️ 
> ⚠️ ▪️ For the optical cameras, the **Grayscale Mode** for all cameras is set to **Auto**. To do this, in the **System** panel, click the **Vicon Cameras** heading to select all optical cameras and in the **Optical Setup** section below, change **Grayscale Mode** to **Auto**.