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Is it just with those eye pieces that you struggle?
I owned a pair of Pentax 8.5mm a while ago which were optically great but I struggled merging with these.
Usually a convergence issue comes from some mechanical misalignment of the eyepieces caused by the binoviewer. I noticed this with the Baader Maxbrights which had 3 thumbs screws. Since moving to the Baader MkV and their different tightening mechanism I haven’t had the issue generally.
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