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Carl
Have a look on IIS for Als collimation aid. I've recently purchased a 10" GSO RC and found that using a real star and ccd camera I was able to get fairly close to collimated but I suspected I was out a fraction. This was confirmed but using Al's collimation aid and I was able to tweak it just to perfection which is what these GSO scopes require. I've Used nothing else for my SCT. And RC scopes and found it is the simplest and quickest means to get perfect collimation.
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