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I have a qhy5L II mono on a fixed OAG, ie: I can't easily rotate anything. So far I have never failed to get a guide star, in fact maxim has never failed to auto find a star to calibrate or guide on. That is no mean feat either, even lodestar users have trouble getting maxim to auto calibrate/guide. Pros: Clean image, sensitive and cheapish. Cons: weird threads on the front.
The qhy5L II is the size of an eyepiece so goes in the eyepiece holder of any scope.
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