Full frame it should get a look.

DX - I would pass. I used it on my D300 and when I compared it to the Tokina 12-24 I sold it and bought the Tokina. The Tokina is much better in every way.

freedom7 said:
Anyone know what the quality is like on the super wide Sigma 12-24?

It's a great lens for the money. It covers full frame!

Wide open, it is sharp in the centre and soft at the edges. It performs best stopped down to f/8-f/11, when it is sharp across the frame. Contrast is good and it is surprisingly resistant to flare for such a wide angle of view.

Its particular strength is its lack of rectilinear distortion. Effectively, there is none. Sigma has made a remarkable job of correcting distortion that could reasonably be expected to be severe.

The weakness, as always, is Sigma's variable build quality. If you get a good one, it's a fine lens. If you get a bad one, it will probably fail just when you need it not to.

Thanks FT
Brother is giving me the lens so wondered what its limitations were.

Yea, if you're talking full-frame it's worth a strong consideration. I'd get it in a heartbeat if I didn't already have 14mm covered. On crop sensors the Tokinas and Nikons are better (build and image quality) and cheaper and faster.

I'll admit being biased though. The Tokina AT-X Pro series of lenses is the only third-party lenses I've ever been so impressed with. I shot quite a bit with most the crop ultrawides before buying my 11-16, and while the Sigma 12-24 feels much better than the Sigma 10-20 (and seems to flare less) (and totally smokes the crapfest Tamron 11-18 (never tried the Tamron 10-24)) it still felt inferior.

I don't mind it. It's not a particularly bright lens, but it'll get the job done. Haven't had any problems with it, but then again, I don't use it much.

This is the only example I have uploaded right now:
http://www.flickr.com/photos/friedtoast/4832384502/

For UW on full-frame, it's hard to beat the price. If you don't need the f2.8, then it might be worth considering.

Anyone know what the quality is like on the super wide Sigma 12-24?