Hi again Justin. 42 is about the critical focal zone of the scope - good call. there are many questions with that answer
If any use:
1. First step was to laser align the focal plane to be parallel to the camera face (critical and still not perfect).
2. wait until the mirror has cooled to within 2 degrees or so of ambient.
3. Carefully laser align the two mirrors through the coma corrector while the scope is pointing in roughly the direction of the target. Check the alignment by ensuring that the
slightly out of focus stars are concentric. If not, go back and do it again.
4. Then focus carefully to ensure that the stars are as small as possible and that they are as round as possible. I use Nebulosity3, which has a very useful focusing process based on the half flux radius measure.
regards ray