The 90 degree cameras have a pretty narrow depth of focus, so they’re easier to use on smaller systems. If you focus the camera on a circle surrounding your center page, effectively averaging the focus between the middle and the edges, that will help overall with placement.
This is the chart of minimum mounting heights for all the cameras we sell, based on your machine size:
The 5mp-120 would likely be a better option for you - where are you located?
It really depends on your mounting height, and the two 120 degree lenses don’t see the same amount of bed area because of the way the lenses are mounted:
The 8mp-N-120 has a wider viewing angle, so it doesn’t need to be mounted as high. If you mount it where you have the current one, you’ll see extra area around the bed, but that shouldn’t be a big deal.
The lenses used in the 5mp cameras use an M8-size thread. You should be able to find other lenses with that same thread size on AliExpress and possibly other sites as well, allowing you to try a couple different options. In theory, just about any available USB webcam should work with LightBurn, but in practice there are still some compatibility issues with some that we’re trying to pin down. If you’re using the ‘Custom’ capture option in the settings, you’re probably ok to try a couple other options. Spinel and ELP cameras from Amazon have tested well for me.
1100mm is a big bed, but the camera captures a 2592 x 1944 image, meaning you should get about 2 capture pixels for each mm of bed area in X and Y, giving you about 1mm of theoretical maximum accuracy. If that’s enough, then it’s a lens problem. The 8mp-N camera captures 3264 pixels across, so you’ll increase the possible accuracy a little, but the difference won’t be huge.
In the last images the camera was considerably closer to the laser bed and yet the calibration values were still bad. What can be the cause there? I mean if even at closer distances I can’t get the lens calibration done I’m unsure if any other camera would help.
The sides were still pretty blurry in that image, and that would play a big part. It also looks like you just had the pattern on paper, and it was wrinkled, not glued to something flat. That will mess things up a lot - the software knows what the pattern is supposed to look like, so any difference between the theoretically perfect version and what the camera sees is assumed to be lens distortion.