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I have to use an AO unit(Starlight Xpress) with my G8 at 770mm focal length to get consistent results. The g8 can never decide whether to be perfect or hopeless. With my AP900 I get round stars at 2500mm focal length. Nevertheless, someone with the same setup as mine says that he gets slightly better FWHM by using an AO unit, even though he gets round stars without it. Anecdotal evidence is that an AO unit will always improve things. It turns crap into acceptable and it turns good into excellent.
Geoff
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