|The Sigma 12-24mm zoom lens on a Nikon D800|
I performed most of my tests at the widest focal lengths, figuring that anyone acquiring this lens is doing so primarily for the 12mm length, and, if anyone wanted a 24mm, there are much better options available. Personally, I would have preferred for Sigma to simply have made a 12mm prime instead. It would have been easier to compute and less of the optical compromise necessary in manufacturing a zoom lens.
It is not a huge lens, measuring 3.3" x 4.7" (83.82 x 119.38 mm), and weighs 23.63 oz (670 g). The scalloped lens shade is built into the lens. The lens shade is in two parts and can double to convert the lens into a circular, pseudo-fisheye. Its 12-24mm zoom range covers an impressive viewing range of 122°- 84°
This Sigma 12-24mm lens is priced at $949, and is an update -- and significant improvement -- over a prior model.
|The extreme wide angle reaches high into the deeper blue area of the sky for more dramatic effects with clouds.|
|A 12mm panoramic vista of lower Manhattan with the Manhattan and Brooklyn bridges.|
In general, Sigma has done a decent job of controlling chromatic aberration in the lens. I did some tests where I know I would be pushing the limits, such as in the photo below. Vignetting and rectilinear distortion are quite apparent, especially at the widest focal lengths, but all of this is something I expect when pushing the limits of lens technology with such a wide angle.
|This scene was taken to illustrate the chromatic aberration of the lens. Download a high res, side-by-side comparison of the image, both with and without correction using Adobe Camera RAW. Download by clicking here. The chromatic aberration is most apparent in the building in the upper left corner of the frame. Corner softness is also evident in this sample, but the high resolution characteristics of the lens in the main areas is a big plus.|
|Since Adobe Camera RAW already has the data for the Sigma 12-24mm lens, simply checking the enabling boxes for lens corrections corrects the lens flaws of vignetting, distortion, and chromatic aberration.|
|The extreme wide angle allows for dramatic framing of a scene by using foreground element, as in this 12mm vista of London Bridge. Click here for a high res version of this image.|
|Stonehenge with foreground detail.|
|The 12mm focal length allows you to come in close to the foreground and still include the entire scene. This image will illustrate the amount of corner softness of the lens at its widest focal length. Click here to download a high res file of this image.|
|Architectural shots, such as this interior of the Fox Talbot ancestral home, is a natural use of an extreme wide angle.|
|Bryce Canyon taken at 14mm and f/10.|
|New York's Times Square at a 17mm setting.|
|The unusual perspective of integrating foreground detail with a background scene is what this lens is all about.|
I suspected coming into this review that this would be a lens with problems, but, as I mentioned earlier, if you need the drama it can deliver, you will have to pay the piper with some post-processing work. As it turned out, the corrections are simple and fully justified adding this lens to my personal arsenal of optics for my Nikon system. The only other 12mm lens made for a full frame camera is the Voigtlander Heliar 12mm f/5/6. The only digital camera where it can be used is on a Leica M series, and it requires considerable post-processing correction to beat its images into submission. My review of that lens can be read here.
Bottom line is, as 12mm is a very rare and specialized focal length, I would rather have the lens with the distortions than not have the lens at all. This is particularly the case when most of the problems are so easily corrected in post-processing through Adobe Camera Raw. I chose the photo samples above to illustrate where and why a lens with such an extreme wide angle comes into play.
The Sigma 12-24mm f/4.5-5.6 EX DG ASP HSM II lens comes in mounts for Nikon, Canon, Sony, and Sigma. It can also be used on APS-C sensors where it becomes a 18-36mm short zoom and eliminates much of the distortion because of cropping due to the smaller-sized sensor.
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The Sigma 12-24mm f/4.5-5.6 EX DG lens for Sigma is available at: BH-Photo