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I haven't used one. But I have read many times that the gain from an AO unit SBIG or otherwise is on long focal length scopes.
How long?
Arbitrarily - longer than about 1260 to 1500mm.
If you look over the net you generally would not find one used under about 1500mm focal length.
The reasoning would be at >1500mm the seeing starts to become quite noticeable on the guide star and images.
Greg.
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