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Darryl,
The Hyperions do a pretty good job down to F5. I don't think I would like them in anything much faster than F5 without a paracorr.
I have tried several different focal length versions in my 10"/F5 and they were quite good, but I sensed it was as fast as they wanted to go. I haven't tried them in the 18"/F4.5 Obsession. I am sure in those two scopes you would like the Hyperions.
Cheers,
John B
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