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They're fine and frankly I don't know why they're so rare, quite useful IMHO. Maybe we should try to coerce one of the makers of CNC crayfords to make a batch. Something akin to the old Unitron Unihex, for 2" barrels and with a dielectric mirror would be pretty sweet.
The difficulty I suspect is these add really only useable on slower refractors, cassegrains SCT's and mak's - no good on newtonians.
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