Just feedback. I installed the 60 degree camera on my K40. The picture is fantastic once focused and configured. Really happy with it.
If you are looking to put a camera on the inside lip of the lid of a K40 I suggest you consider the 90 degree camera. The 60 works well for me but it is j-u-s-t b-a-r-e-l-y picking up the edges of the burn area. I think I would have gone for the over-coverage offered by the 90 degree cam. Just my 2 cents.
Thanks, LightBurn Team!