[postcardcv]

I have a bit of a fancy for a Sigma 12-24 lens, my widest lens at the moment is 17-40 which is wide enough most of the time but I fancy going really wide. I've read some really good thing about the images that come out of the lens but was wondering about other factors like the focus and the build. If I do go for one I'd have to sell the 17-40 to fund it so don't want to jump unless I'm sure. I'm hoping to get to a shop and have a play with one and take some shop to compare the two but would keen to hear from anyone who's lived with this lens. I may also have a play with the Sigma 15mm fisheye...