Originally posted by joelR
So you like the Ultron 21mm better than the Contax 21mm? They seem to be pretty close in price with the Ultron being fast and better manual focus. I won't be buying either soon but a good wide/ultra wide is on my life of future hopefuls.
I've only shot a couple a dozen images with the Ultron but so far there is only one shot with any trace of colour shift in the borders (on my NEX-5n) and I've been shooting to get it. The Zeiss and Contax G 21mm are all bad in that respect, except 21/2.8 ZM which doesn't show much colour shift but is unsuably soft in the borders at infinity focus.
The Ultron is sharp as sharp can be in the centre right from f1.8 and the borders are very very good. So yeah, so far I am convinced it's the 21mm for the NEX.