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Hi Paul. Yes I leave the diagonal in while shooting because it supposedly gives you a bit more image scale.
When I first got the the refractor, I collimated without the diagonal. Then I thought: well if I'm going to use the diagonal on it full time, why not collimate with the diagonal on there....There is a difference in collimation between having it on & not so I found out.
IE: collimate without the diagonal then put the diagonal on & check....it will be out a fair bit!
Would it be better to lose the diagonal while I'm shooting perhaps?
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