Hi Simon, I have a Widescan 111 16mm, that I have used in a F15 refractor for the last year, great views, as you would expect in a
slow scope. I'm about to buy a lightbridge so I tried it in a friends G.S.O. 12" F5 and NO SEAGULLS AND STILL GREAT VIEWS. So going on this experience I can highly recommend these eyepieces.
They come in 1 1/4", 13mm, 16mm, 20mm, + 2", 30mm. They are available through Sirius Optics in Queensland.
www.sirius-optics.com.au
BTW They are all 84D A.F.O.V.!!!. Cheers, John.