I have owned this lens for about nine months now and have used it for both bird and mammal photography. I sold the Nikon 500mm f4 that I previously owned and after much research, eventually bought this one. I was much influenced by the superb testing of this lens by Canadian photographer Brad Hill.

Durable; Great Features; Great Picture Quality

Bulky; Heavy

If, like me, you're accustomed to edge-to-edge sharpness and couldn't bring yourself to even press the shutter-button, with the expectation of chromatic aberration, with it's purple-fringes, then this lens is for you.

Sigma Wide Zoom Lens . If you want a panorama of a landscape then you should try this lens. Described as 12 - 24mm f5-5.6 EX DG Aspherical HSM Technical details first. To fit Sigma, Canon and Nikon (D ) Lens construction Groups/elements 12 / 16 Angle of view (degrees) 122.0 - 84.1 Diaphragm blades 6...

Excellent field of view

none that I have found in months of use

If you're into high quality glass, this is the kind of lens you can get lost in. Build quality is exceptional, performance is outstanding and…I'm getting ahead of myself, but you'll see the world in a whole new way when you use this lens.

I do not plan to create a full Sigma 12-24mm f/4.5-5.6 EX DG HSM Lens review - hopefully the standardized results for this lens will be helpful to you.

This ultra-wide angle zoom lens from Sigma projects an image circle big enough for full frame digital/35mm and is still very wide on a cropped sensor. We take a look at how it performs.

Enormous field of view; Amazing control of distortions; Solid build quality with good protection of front element

Difficult to use front mounted filters (Though not impossible; Bulbous front element needs careful handling

Sigma 12-24mm f/4.5-5.6 EX DG HSM is one of about half a dozen ultra wide zoom lenses in Sigma's modern lens lineup. This is also one of the widest full-frame zoom lenses available on the market at this time (there are a couple of 'wider' APS-C type lenses offered by Canon, Tokina as well as Sigma...

I used to have a Sigma 15-30 before purchasing this lens, but I needed a larger angle coverage for some architectural pictures. This lens has no real distortion even at 12mm, and it's quite sharp if you use it at f.5,6 and over.

Very wide; Sharp over f.5,6; No distortion at all, a miracle

Needs to be stopped at f.8 and over for the best results