At a glance:
- EF-Mount Lens/Full-Frame Format
- Aperture Range: f/4 to 22
- FLD and Aspherical Elements
- Super Multi-Layer Coating
- Hyper Sonic AF Motor, Manual Override
- Rounded 9-Blade Diaphragm
- TSC Material, Brass Bayonet Mount
- Dust- and Splash-Proof Construction
- Compatible with Sigma USB Dock
From the conclusion:
Overall the Sigma 12-24mm f/4 DG HSM ART is a very competent lens. It has few major flaws. Chromatic aberrations are well controlled, distortion is low, and vignette, while clearly present at f/4, isn’t quite as bad as some of the recent releases from other major companies. It does a very credible job when shooting the night sky, though having a relatively small maximum aperture puts it at a bit of disadvantage […]
It falls a little short of a true 24mm, but that isn’t unusual, and I would argue that the true 12mm on the wide end is ultimately more important. […] One thing to note, […] is that the 12-24 ART is optimized for f/4-5.6 performance (at least on the wide end of the focal range) and I actually saw a trend where the image quality tended to be a bit worse rather than better as the lens was stopped down.
You can go for the written review, or watch the two videos below to learn about the Sigma 12-24mm f/4 Art.
Below: Image quality examination: