You don’t even have to have the camera mounted to the machine to do the initial lens calibration - I mention that in the video. It’s only determining the curvature and distortion caused by the lens during that process, so the machine doesn’t need to be involved at all. Some cameras see a much larger image than the bed of the machine, and you’d need to move the calibration image off the bed to get out there into the camera view - I have to handle all of these cases, which is part of what makes getting it right so hard.
The top/bottom are trimmed off because you’re using a camera with a wider aspect ratio than the bed of your laser, and I have a bug. I’m working on fixing that, and when I do, you’ll have to re-do the alignment part, but that’s it.
If you switch to a lens with a different focal length, for the moment you’d need to redo the alignment. This is a relatively rare case, though I’m going to work through the math to allow this in the future. I have to handle it for machines where the laser head raises/lowers instead of the bed, so it needs to get done, but it’s not simple.
I could allow for multiple profiles - that would work for your case, and a number of others. I’ll give that some thought.