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Hi there, I could have used the diagonal from the 60mm, 700mm fl Meade refractor, as those fl scopes usually are 0.965" at the focuser end and 1.25" for the EP, but it usually has a very ordinary mirror surface.
The nice thing about some of the older 415mm fl 60mm achromats is they do have a half decent prism doing the job, worth doing the mod for in this case.
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