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

I love this lens. I love it for promo photos, realestate , and even group photos. The only thing is I thought o was buying it in Canadian dollars and it ended up being U.S. prices. Ouch.

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.

The Sigma 12-24mm F4 DG HSM Art is a fantastic ultra-wide-angle zoom lens that significantly undercuts the price of its main rivals whilst offering almost comparable image and build quality. Image quality is excellent.

Sigma unveiled its third generation wide-angle zoom lens, the 12-24mm f/4 DG HSM Art lens, on 16 September, just before Photokina 2016. A significant update to the 12-24mm f/4.5-5.6 HSM DG II model, it comes with Canon EF, Nikon F (FX) and Sigma SA mounts.

I have been using the generation one Sigma 12-24mm lens for wide landscapes and architectual shots for many years. The older lens was sharp in the center but soft at the edges and corners even when stopped down. The older lens was at its worst in the 12-15mm range, right where you needed it most.

Given the high bar set by Sigma's Art lenses, when I first heard about Sigma releasing this lens at a fairly affordable price I was extremely excited. Unfortunately though, the lens fell short in several aspects.

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 12-24mm F4 DG HSM is a Fixed aperture Auto Focus (AF) Ultra-Wideangle Zoom lens with 35mm FF max sensor coverage, and it is designed to be used with SA Mount cameras. What type of photography is the Sigma 12-24mm F4 DG HSM lens good for?

Autofocus, Distance Scale, Hood supplied, Full-time Manual Focusing, Fast Aperture at Tele end, Constant f4 aperture throughout the range, Covers Full-Frame Sensor, 9 Diaphragm Blades for Smooth Bokeh, Extreme Wide-angle capability, Minimum focus distance of, 0.24m / 9.4 inch, No Weather Sealing,...

Autofocus, Distance Scale, Hood supplied, Full-time Manual Focusing, Fast Aperture at Tele end, Constant f4 aperture throughout the range, Covers Full-Frame Sensor, 9 Diaphragm Blades for Smooth Bokeh, Extreme Wide-angle capability, Minimum focus distance of, 0.24m / 9.4 inch, No Weather Sealing,...

Agai, lack of Sigma's QC: i bought one second hand, but this lens is a lemon, you can throw it away. The lens was soft overall no matter what i used, really bad till f7.1, from f8 till f22 was overall soft.

nothing

lack of Sigma's QC; lens is soft overall; slow AF