# Calibrating projectors using Iris
To start calibrating projectors using Iris, open the **Iris** window, that you can find in **Tools** -> **Iris**.
On the right hand side, first select the cameras and the projectors you’d like to use for the calibration process.
Now let’s go through the settings on the right:
* **IrisVirtual** enables a feature further explained in chapter [IrisVirtual](/projection-mapping/iris/irisvirtual.md). For calibrating real projectors, this checkbox should be unchecked.
* **Include Iris camera points** will try to include the points you have selected in 3D Cal window of the Iris camera in the Projector calibration. **In 99% of the cases, you should leave this checkbox checked.**
* **Show advanced checkbox** exposes some additional settings. In most cases, you won't need to adjust any of those.
* **Export calibration images:** if this checkbox is checked every camera image taken throughout the calibration process will get saved into *ProgramData\Lightact\Lightact4\iris*. You should leave this checked, because if you have problems with your calibration and reach out to us for support, these images is the first thing we will ask for.
* **Adjust projection points** can improve your calibration by adjusting the projected points to a more accurate position, lowering the reprojection error. The *fix delta \[px]* property indicates the range in which the points will be adjusted in.
* **Show in *****Explorer*** button opens *Windows Explorer* in the abovementioned directory *Calibrate* button initiates the calibration process.
As you probably figured out by now, you can start the calibration process by clicking on the **Calibrate** button.
After the calibration process is complete, all the selected projectors will get calibrated and in their 3DCal windows, there will be a larger number of calibration points:
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