I bought this lens specifically for its Fish-Eye barrel effects for video. It's a very expensive lens for this single effect so if you're looking for a good wide-angle lens for a cropped sensor camera such as the Canon 7D, I highly recommend the Tokina 11-16mm f/2.8 AT-X 116 PRO DX, which is nearly...

Amazing wide-angle for Canon 7D or any other 1.6x crop sensor; Bought this for video work with my 7D and have used it many times, either for the fun fish-eye effect, or to show a 180 degree panorama.

Not sharp at the f/2.8 range in comparison to other Canon or Tokina lenses; Stopped up to the 4 range and you'll see a big difference but lose a lot of the low light capability that makes this lens appealing.

I wasn't sure about this lens when I couldn't find conclusive reviews or samples for this lens, but I'm glad that I took a chance. It's sharp and slightly wider than the Tokina 10-17mm (did a side by side with a friend's Tokina).

Consistent Output; Durable; Easily Interchangeable; Easy To Clean; Rugged; Sharp Focus; Strong Construction

CA in high contrast

Fisheye lenses aren't like ordinary wide-angles. For a start, their angle of view is wider (a full 180 degrees on a Nikon DSLR) and second they don't attempt to correct straight lines, rendering them instead as curves. These two factors produce distinctive and highly odd renditions of the world.

Note that the photo above does not match the lens in question. Also, the written descriptiion above refers to a zoom ().

Fisheye lenses like this Sigma 10mm f/2.8 EX DC HSM are very popular thanks to massive interest in panorama photography

Excellent resolution when stopped down; Good resolution in the centre at f/2.8; Chromatic Aberrations kept to acceptable levels; Build Quality; Silent focus motor

Curved hood makes lens difficult to place down without lens caps

The Hyper-Sonic Motor (HSM) not only makes the autofocus practically silent but it also means that Nikon D-SLRs without built-in motors can still use autofocus mode.

Yes, I would recommend this to a friend

Easily Interchangeable; Fast / accurate auto-focus; Great effects; Lightweight

Although I have all Canon lenses and mostly L glass, I am over the top with this little gem. I love this Sigma 10mm! On my 1.6 body it will give me 162 degree angle of view. There is a filter in the rear of the lens which is very nice for adding ND filters when shooting slowmo water.

Very sharp; Will it distort? Hello! This is a Fisheye review

Cap lining is wearing out; :

very nice wide effect.. a very good fisheye.. was wondering if i would buy a canon 15mm fisheye.. but chose sigma 10mm fisheye and was very pleased with the results.

Consistent Output; Durable; Quick Focus; Sharp Focus

an alternate view of the world, warning this lens is addictive both my son and i have been sharing this lens to great effect buy it if you want to have a good lens for the money well made like most sigma lenses and comes with a decent pouch and lens hood and you want a diagonal fisheye view of...