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I don't get much chance to do comparisons but I own two of the eps discussed here. I've had a 20mm T2 for a couple of years and it's great. I mean I love it. Pinpoint stars, good colour, contrast, edge performance, comforable 'feel'. I'd never sell it.
I've had a 28mm UWAN for a couple of months and so far I'm happy with it. It's a big step up from my previous wide-field ep (30mm 1rpd) and I haven't seen it next to naglers so I can't say too much. My feeling though is that it's very good. At f/8 it's essentially perfect to the edge, indicating (I believe) that the ep is well corrected. At f/5 there is a bit of unobtusive coma but in the 40cm f/4.5 I came away thinking that I need a paracorr. On my budget I can't imagine getting rid of it soon.
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