Yes, I would recommend this to a friend

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

At 2.8, 3.5, 5.6--lens goes soft--especially at 2.8--which is disappointing since I shoot live music that is dark most of the times. At F8--its great, but F8 is the exception not the norm of my shooting. Too bad. I had the first lens glass fall out and Sigma replaced right away.

at F8 or less--very sharp

at 2.8---focus is off

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; :

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

One of my "big boyzzz" lenses. Very creative and very strong optics. Beautiful finish....

very nice built; fantastic optics - very sharp and beautifull colours

a bit expensive; corner-cromatic-aberration

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

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...

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

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

Compared Nikon lens and Sigma. After evaluation came up to a conclusion that Sigma is better on my D3. Took great photos of night Manhattan.