Review

http://www.focus-numerique.com/test-3658/zoom-sigma-art-12-24-mm-f4-dg-hsm-test-8.html

In stock at https://www.bhphotovideo.com/c/product/1282158-REG/sigma_205954_500mm_f_4_dg_os.html

Fat girls on fat lens

http://petapixel.com/2016/11/04/can-sigmas-85mm-12-24mm-art-lenses-replace-canikon-favorites/

Samples

http://www.photographyblog.com/previews/sigma_12_24mm_f4_dg_hsm_photos/

Review

Image quality is very good. Chromatic aberrations are very small, bokeh is impressive despite the slow f/4 aperture and the wide-angle nature of the lens, and coating successfully prevents contrast loss attributable to flare. Small optical issues are some vignetting, particularly at 12mm, obvious barrel distortion at the 12mm wide-angle focal length, and a slight lack of edge sharpness when shooting wide-open at f/4 throughout the zoom range.

http://www.photographyblog.com/reviews/sigma_12_24mm_f4_dg_hsm_review/

http://dc.watch.impress.co.jp/docs/review/newproduct/1043514.html

Review

https://www.cameralabs.com/sigma-12-24mm-f4-art-review/

The electromagnetic shutter on the Nikon version of this lens is not compatible with the lever-arm lens aperture control mechanisms of speedboosters and MFT adapters. Sigma makes an active mount converter that is compatible only with the Canon version of the lens and Sony E-mount cameras. Sigma's adapter cannot be used with a speedbooster either.

New lens firmware

This firmware allows compatibility with Canon’s in-camera Lens Aberration Correction function to enable correction matching the optical characteristics of each lens. It also corrects the phenomenon that abnormal images appear or operation errors occur when the function is enabled. This firmware also corrects the phenomenon whereby the continuous shooting speed decreases in certain combinations with some cameras when used with the 14-24mm F2.8 DG HSM | Art for Canon, and the phenomenon whereby the AF speed occasionally becomes unstable when used with the 100-400mm F5-6.3 DG OS HSM | Contemporary for Canon.

For customers who own the SIGMA USB DOCK and applicable products listed below, please update the firmware via SIGMA Optimization Pro. Before updating the firmware using the SIGMA USB DOCK, please ensure to update SIGMA Optimization Pro to Ver. 1.4.1 or later for Windows, and Ver. 1.4.0 or later for Macintosh.

Applicable Products

• SIGMA 14mm F1.8 DG HSM | Art for CANON
• SIGMA 20mm F1.4 DG HSM | Art for CANON
• SIGMA 24mm F1.4 DG HSM | Art for CANON
• SIGMA 12-24mm F4 DG HSM | Art for CANON
• SIGMA 50-100mm F1.8 DC HSM | Art for CANON

Benefits of the Update

It has ensured compatibility with Canon’s in-camera Lens Aberration Correction function, which enables correction matching the optical characteristics of the attached lens.* It has corrected the phenomenon that abnormal images appear or operation errors occur when Canon’s in-camera Lens Aberration Correction function is enabled.

• Compatible Canon camera models:EOS-1DX mark II, EOS 5Ds, EOS 5Ds R, EOS 5D mark IV, EOS 6D mark II, EOS 80D, EOS 8000D(EOS Rebel T6s, EOS 760D), EOS 9000D(EOS 77D) , EOS Kiss x8i(EOS Rebel T6i, EOS 750D), EOS Kiss x9i(EOS Rebel T7i, EOS 800D), EOS Kiss x9(EOS Rebel SL2, EOS 200D)

https://www.sigma-global.com/jp/download/lenses/sigma-optimization-pro/