I've used a lot of XW's in a lot of scopes from Newts, to 'Fractors to SCT's and they are all excellent in all scopes, except for a slight bit of FC coming from the 14mm and 20mm XW's in Newtonians.
None of the FC can be seen in the SCT's from the 14mm or 20mm XW's.
Cheers!
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