I bought this lens for a STEAL of a price through Amazon's Warehouse Deals. I've never bought anything used from them before, so I was a bit skeptical and I was worried that the condition of the lens might be bad. Was I wrong! This lens only cost me a fraction of a new lens...

Excellent lens, the macro effects are outstanding, this is what I was looking for in a micro lens. I prefer to use MF on macro photography as it gives me more control of the background.

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.

This was a gift for my son's 25th birthday, he is a skater, surfer, snowboarder, He love's this lens. I is great for the Skate Barn photo's. I would recommend it!

Easily Interchangeable; Fast / accurate auto-focus; Lightweight

everything is good!

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

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.