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Even tracking doesn't help here. At the mag a 5mm EP gives you, & you move the primary screw 1/16th turn, thats usually enough to throw the star out of the FOV....then you have to find the star again, centre it, re-align the finder! It really is an exercise in frustration......the patience & precise movement of a surgeon is needed lol.
30 years ago if my collimation was out by just a little bit it would take on average 1-6 hrs to get it right.....If it was freezing out, I'd end up sweating like a pig from my temper on the border-line of throwing a tantrum the size of everest!
I suggest you stick with the 12mm & get it the best you can perhaps. You can check with the 5mm......but it's up to you weather U wanna attempt tweaking using the 5mm..I don't suggest U try it @ 5mm until your more familiar with doing it..
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