A real funlens, incredible sharp from f6.3, beautiful colours, great flare-control, very nice construccion! Only the CA′s are quiete strong in both corners, but we are talking here about 10mm!

sharp from f4.5; very sharp from f6.3; nice building; f2.8 for interior

CA?′S - corner

Clear focus (don't use auto ever) wide angle shots good value for the money.

It's a great for landscape and any static objects, but my primary use is for action sports and sadly the AF is just not quick enough for it. When used for video the quality is great !

Durable; Easily Interchangeable; Strong Construction

Blurry Focus

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

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

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.

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.

Professional photographer and expert reviewer checks out Sigma's classy fisheye optic A wide aperture diagonal fisheye for APS-C sensor cameras, which offers an angle of view of 180 degrees from corner to corner.

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

If you ever want a unique point of view try a "fisheye" lens. Like looking through a door peephole (which in fact is a "fisheye" type) this order of lens sacrifices linear correction in favor of a very wide angle of view.