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Star testing
I have a Vixen VC200L. Triaxial collimation adjustment. Primary, Secondary, Baffle tube with internal corrector all adjustable.
I do the whole thing by star testing and incremental adjusting. Work slowly and carefully, take your time. Nights of full moon are good for this. I bought the Vixen second hand from someone who stuffed the collimation. I collimated the Vixen after I first bought it, then again last year about 7 years after the first collimating. It holds well and so it’s worth putting the time to do it well.
Joe
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