Sigma 24mm f/1.4 DG HSM Art
(From Sigma lens literature) The Sigma 24mm 1.4 DG HSM Art is a state of the art wide-angle prime lens designed for Full Frame camera but can work with APS-C sensors as well. Using over 50 years of lens making experience, particularly the knowledge gained from the 35mm 1.4 Art and the 50mm 1.4 Art, the 24mm 1.4 Art is aimed at being the new standard for fast aperture wide angle prime lenses.
The latest optical design allows for the utmost in image quality with careful attention paid to the edge to edge performance. An optimized power layout places the aspherical lens elements in the rear and adjusts the incidence angle of light source allowing for great performance wide open. Using premium FLD & SLD glass elements, the lens brings aberrations and distortion to a minimum, an issue many wide-angle lenses suffer from. With class leading performance, this lens is ideal for wedding photography, landscape photography, videography, astrophotography, lowlight/indoor photography and event photography.
The Sigma 24mm Art is compatible with the USB dock to update and customize and is also compatible with the Mount Conversion Service. A staple procedure for the Global Vision lines, every lens will be tested using the proprietary "A1" measuring system.
Sigma 24mm f/1.4 DG HSM Art
Sigma 24mm f/1.4 DG HSM Art User Reviews
10 out of 10 points and recommended by Airy (16 reviews)Sharpness; low aberrations; close focus; contrast; good working against the lightMF not that nice; AF precise but slow; size and weight of course
A f/1.4 lens is meant to be used wide open at least sometimes (otherwise an f/2.8 lens is sure to be cheaper, lighter, and just as good). This one does meet expectations. Images shot wide open are pretty sharp already, and above all very "clean". In particular, I barely see any LoCA or color fringing on OOF objects, which is IMHO the nastiest aberration. So f/1.4 will get you nice pictures with good subject isolation and decent to good bokeh. Flare is also well controlled; shooting directly into lamps and under-exposing will reveal many details, not drowning them into any kind of veil.reviewed July 11th, 2015
No real cons. Vignetting is reasonable. The MF ring is usable, but focus throw is short and there is some "dry friction" feel that I do not like. Fortunately the AF is precise and does not generally hunt, the chocolate side of it being slow. Max magnification is around 1:5, which is very useful. Color is OK, but tends to be warmish: I preferred the Samyang 24/1.4 tested the same day from that point of view (and, needless to say, the Samyang has a better MF ring).
I have not tested it yet at night. From other reviews, I suspect that there is some coma (in which case the Zeiss 25/2 would probably be the sole alternative, and twice the price, or maybe the Nikkor 14/24/2.8, which is a totally different animal).
Bottom line : if you need a f/1.4 lens, this one is for you. If you do not need AF, the Samyang is a reasonable alternative, with somewhat lower resolution but excellent IQ too (maybe even better bokeh on close-up), and at a lower price - but same bang for the buck, so to say.
P.S. make sure that AF is properly calibrated, or test the lens using manual focus before you make your mind. I had to fine-tune mine, due to significant front focussing. Also, buying the dock may be a good idea.