Looking for an amazing WideZoom? Tokina Vs Sigma
Tokina 11-16mm f/2.8 AT-X116 Pro DX II Digital Zoom Lens (for Canon EOS Cameras). It’s a very sharp lens… it also has tremendous depth of field making it great for getting group shots and including backgrounds! However, there is a little distortion at the edges, but there is not more on a lens this wide so you will be certainly not upset by it.
Set her to infinity, point at the sky or landscape (or hyperfocal focus) and you’re ready to shoot without even worrying. Go and get this lens for sky shots and landscapes.