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DX Lens
Nikon digital SLR cameras all use a sensor that is smaller than 35mm film, but the cameras themselves accept standard 35mm format lenses. The decision by Nikon to use a “cropped” sensor in its digital cameras can be debated ad nauseum as to its merits; depending on their subject, photographers either loved or hated the smaller sensor format.DX Lens
While the gains in apparent focal length on telephoto lenses were praised by nature shooters, the downside of this “crop factor” was that now your 17-35mm lens lost its “super-wide” ability and became a pedestrian 26-52mm lens. Many early adopters of digital flocked to their local camera shops to purchase the large (and rather expensive) 14mm Nikkor lens. .
For the first time, here was a lens specifically designed to cover the smaller sensor area of the APS-C digital SLRs. .
Enter the Tokina AT-X Pro 12-24mm f/4.0 DX, the Tamron SP 11-18mm f/4.5-5.6 Di II, and the Sigma 10-20mm f/4.0-5.6 EX HSM. .
Nikonians was able to obtain a production-level sample of each of the four lenses from their respective manufacturers. .

THE SIGMA 12-24mm LENS
If that’s important to you, the Sigma 12-24mm is the clear choice. .

THE TESTS
Chances are, if you want a lens this wide, you’re either shooting landscapes or photojournalism-style photography.
Both cameras were tripod mounted and set to ISO 200, and we used aperture-priority matrix metering. We also shot some images in RAW to evaluate post-processing techniques for removing vignetting and chromatic aberration. .
We also judged the build and handling characteristics of each lens.
So here, alphabetically, are our individual reviews of each of these super-wide lenses, followed by our summary and conclusions..
Many early adopters of digital flocked to their local camera shops to purchase the large (and rather expensive) 14mm Nikkor lens. At least then they had an effective focal length of 21mm; wide enough for some, but not truly “super wide” on a DX format body.
For the first time, here was a lens specifically designed to cover the smaller sensor area of the APS-C digital SLRs. .
Enter the Tokina AT-X Pro 12-24mm f/4.0 DX, the Tamron SP 11-18mm f/4.5-5.6 Di II, and the Sigma 10-20mm f/4.0-5.6 EX HSM. Each of these lenses are priced substantially less than the Nikkor 12-24 DX, and appear to offer attractive options for super-wide zooms. .
Nikonians was able to obtain a production-level sample of each of the four lenses from their respective manufacturers. .

THE SIGMA 12-24mm LENS
All reports are that the Sigma is a very fine lens, and it has the virtue of working on 35mm bodies at all focal lengths. .

THE TESTS
Chances are, if you want a lens this wide, you’re either shooting landscapes or photojournalism-style photography.
To level the playing field between cameras, we shot our test images in JPEG mode with sharpening set to medium-high in the camera. .
We also judged the build and handling characteristics of each lens.
So here, alphabetically, are our individual reviews of each of these super-wide lenses, followed by our summary and conclusions.. To here more click on this >>>>DX Lens