While the Sigma 18-35mm f/1.8 DC HSM Art Lens is designed to cover only an APS-C-sized camera sensor, this lens mounts and functions on a full frame DSLR. And the vignetting is not as bad as you might expect.
The image accompanying this post is a best-case example. Check out the complete full frame vignetting comparison to get the entire picture.
Note that I posted the full Sigma 18-35mm f/1.8 DC HSM Art Lens Review earlier today. Unfortunately, I used the wrong title, saying "First Looks" instead of "Full Review". Sorry for the duplicate post, but I don't want anyone to miss this one. It's a great lens.
The full Sigma 18-35mm f/1.8 DC HSM Art Lens Review is now available.
My opinion? Sigma is on a roll and this is one of their biggest hits to date. MANY kits are going to find an Sigma 18-35 f/1.8 in them.
The demand for this lens is very high. Preorder your Sigma 18-35mm at Adorama.