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Arthur, IMO the Panos are not in the same league optically as the 30mm XW, the latter being practically aberration free right across the FOV at f/5 and superior comfort. Like S2S says 55mm Plossl is not a good choice for an f/5 scope.
S2S, Pentax EPs I've used, XWs and XFs, seem to be spot on wrt specs. 70 and 60 degree FOV, 20 and 18mm eye relief, resp. No more no less.
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