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My collimation is always pretty good and I only do one when I take the mirror out for a clean. If you do it right the first time and tighten the lock screws I can't see why anything should move?
My scope is a 40 y/o 200mm f6 newt so maybe the mirror (pyrex glass) and cell is made different than the newer designs?
But I would be interested in some explanations as to why collimation would change so frequently in some reflectors.
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