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Hi Peter collimating a refractor is simpler than a newtonian , why do you advise against it? Unless your thinking about moving individual lens elements relative to one another. In a collimatable lens cell adjustment is easily made with a Cheshire eyepiece , collimating being achieved when both reflections of the cheshires diagonal reflected by each lens element superimpose.I remember doing this with a skywatcher 150 many years ago.
Philip
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