If the image is curved, it will affect the calibration process and reduce the accuracy.
Mount it to stiff card, foam-board, or wood, so the image remains very, very flat.
The circles image will be approximately 148mm x 105mm (5.8" x 4.1"), and should have at least 6mm (1/4") of white space around the pattern.
You will need to download and print the following image: Calibration-Circles.png The first part of this is accomplished in the Lens Calibration wizard.
In order to use the camera for work placement, it's necessary to "teach" LightBurn how to remove the distortion from your camera lens, and where your camera is in relation to the work area of your laser. There is a YouTube video of the calibration process here: LightBurn Camera Calibration Walkthrough Choose a camera that needs about 50mm (2") less than the distance from your laser bed to the mounting location, just to give you a bit of room for adjustment.
The image above shows the minimum mounting heights for all cameras, given the size of the machine entered at the top. LightBurn will use the size of the selected laser and the information it knows about our cameras to show a list of the minimum mounting heights for each camera we sell, like this: Open the Help menu in LightBurn and choose 'Camera Selection Help'.
You'll see a window that looks like this: In LightBurn, enable the 'Camera Control' window by going to the Window menu and selecting it.