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Originally Posted by GUIDESTAR
Anyway, the sweet spot can be fixed in place at the center of your FOV by using the barlowed laser collimator method. I have one and i can make the collimation adjustments in less than 30 seconds.
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What I dont see mentioned often with the barlowed laser is the importance of the secondary alignment. You must use the laser unbarlowed first and point at the exact centre of the primary. Any error here may be doubled at the target after reflecting off the secondary twice.
This will align the optical axis to the focuser axis. The importance of this is that a barlowed laser target is never close to the focal plane, which of course is the place where collimation is most important.