Hmmm to moźe te 20mm nie będą takie złe, obudowy chyba mają podobne.
Tu pewna opinia z CN:
"Bill,
With respect to how the 19mm Pan and 20mm XW compare, I would say that it will depend upon what characteristics you rate highest.
Eye relief is important: 20mm XW is the choice although I did find I could see the full field of the 19mm Pan with my glasses, but not comfortably.
Edge performance is important: 19mm Pan is the clear choice. The 20mm ES68 is significantly better at the edges in my refractor than the 20mm XW and the 19mm Pan edges out the 20mm ES68.
Edge of field brightening: 19mm Pan. The 20mm XW has mild edge of field brightening in my scope with my eyes. The 19mm Pan has no EOFB at all - not even a hint of it.
Brightness of nebula: 20mm XW. The 20mm XW bested the 20mm ES68 for transmission and the 20mm ES68 slightly and consistently bests the 19mm Pan for brightness of nebula and nebulous clusters.
Sharpness of stars: 19mm Pan. I felt that the 20mm ES68 was easier to get pinpoint sharp stars and that with the 20mm XW the stars seem ever so slightly bloated compared with the 20mm ES. The 19mm Pan is just slightly sharper than that ES68.
Size and weight: 19mm Pan
Smell: 20mm XW (you can't tell me you XW people don't love the smell of the XWs!)
Keep in mind these thoughts involve multiple nights with the 20mm XW and 20mm ES68 and just a single excellent night with the 19mm Pan ... and with just the Vixen 140NA refractor.
Dave"
https://www.cloudynights.com/topic/4507 ... pentax-xw/