With my Intes NM's:
1. My first step at collimation is to pull the secondary holder up against the backside of the meniscus, secure it there and rotate the secondary till it looks right.
2. I then translate the focuser until it's centered front to back over the secondary and recheck its rotation.
3. I use the push-pull tilt screws for the focuser with a sight tube to square up and center the focuser over the secondary as best I can with the focuser fully racked in and out.
4. I repeat steps 2 & 3 if a tweak is needed (not very often)
5. Using my Glatter laser, I adjust the secondary screws so that the laser hits the primary's center spot. The adjustments are usually small since I've pretty much squared the secondary with the meniscus in step 1 and the focuser over the secondary in steps 2 & 3.
6. I use the primary push-pull screw sets to adjust the now barlowed Glatter laser so that the shadow of the primary center dot is centered over the laser's aperture. I run the focuser in and out to make sure the shadow stays reasonably centered (which it usually does).
7. I recheck everything with the sight tube. There may be some slight unevenness in the dimensions of the fully illuminated field but experience tells me this is quite ok.
8. Star test at high power to make sure. Paying special attention to how the diffraction patterns behave at high power close to focus (1-3 rings, each side) and the airy disk at focus.
Edited by Jeff B, 05 May 2016 - 09:28 PM.