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Hi Terry,
you could see if you could borrow a Meade star diagonal or focusser and see if the thumbscrew from that fits yours – at least then you would have a screw to compare against.
Most of these thumbscrews seem to be a bit non-standard to me… Though I must admit I have never measured one.
Callum
From a chromatic aberration point of view probably not – but many prefer wider fields of view, and ‘better’ eyepieces may be better constructed, with better coatings.
I usually use my TV plossls on my Lunt solar scope – i quite like the combination.
Zoom eyepieces seem to be quite popular too, though I don’t have one.
Sunny Skies, Callum
