I am now doing a more serious calibration for different lenses.
Here is an answer from another thread:
The assumption when using the camera is that the distance from the camera to the top of your material will be constant, because the focus point of the beam is also constant. If you use a movable Z bed with a focus block or auto-focus, this will always be true. If you have an adjustable lens tube for focus, or change to a different focal length lens. it will not be true, and that will affect the camera calibration.”
Before I begin to mess up with that stuff, my biggest question:
I have a adjustable lens tube and a movable Z-axis.
If I understand it right, the camera is ALWAYS calibrated to the top surface of the material?
The camera view will be therefore correct if the Z-height of the top surface will stay constant, although I change the focus of the lens slipping the lens tube up or down?