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Thanx for the quick replys-- when you say barlowed laser do you mean a specific design of laser or a barlow with a laser collimator installed in the end of a barlow? I did assess the position of the return beam and it is not centred but not trusting the discrepancy between the two collimators have not yet adjusted the primary. Sight tube to square the foccusser hmm I.d better read a few more posts.
Alex.
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