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Hi Mark,
I have GSO Superviews 20mm,30mm,42mm. Using with my 4.5"f4.4,8"f5 and 14"f5.1 reflectors. The 42mm gives an exit pupil too big for scopes this fast. The 30mm with its 68deg field is okay for scopes of around f5 and slower with its wide field of view, is a great ocular for general sweeps and finding objects of interest.At f5 you have a 6mm exit pupil so though marginal for some older eyes this would be my recommendation.I use the 20mm with/without 2x barlow on my 4.5" and this works really well,(also to be recommended).
Stephen.
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