As you can see, this new Sigma lens has an image stabilization feature (OS) and also incorporates the HSM (Hyper Sonic Motor) for fast and silent focusing mechanism. Sigma claims that the OS in the 17-50mm offers a four stops advantage over non-OS Sigma lenses. The anti-shake system is helpful for preventing camera shakes and together with a fast aperture, it will allow you to shoot image in very low light conditions handheld.
The Sigma 17-50mm F2.8 EX DC OS HSM included FLD glass element that it is said to be equal to fluorite glass, which can be found on Canon high-end L lenses. We haven't had a chance to find reviews that have tested this lens, but using FLD glass elements should minimize chromatic aberration and allows photographers to capture high contrast image.
Sigma 17-50mm F2.8 also includes one hybrid aspherical lens for allowing taking wide angle pictures with minimal distortions. Furthermore, Sigma used its Super Muly-Layer Coating in order to minimize ghosting.
The lens minimum aperture is f/22, has 17 elements in 14 groups with 2 FLD glass elements. Weighting 565g and 84mm x 92mm dimensions, this lens will probably become a very popular lens among many photographers who want a fast standard-zoom lens with wide aperture and all the benefits that comes with the HSM, OS and the FLD glass elements used in this new Sigma lens.
Here is an unboxing video of the brand new Sigma 17-50mm F2.8 EX DC OS HSM:
Simga has released the 17-50mm F2.8 OS lens after its competitor Tamron, has already released its Tamron SP AF 17-50mm F2.8 XR Di II VC LD Aspherical [IF] lens (Model B005). The Tamron's also have an image stabilization feature (called VC), includes aspherical element and LD glass and the same aperture and focal range. Those two lenses will compete against each other for market share among DSLR photographers.
Standard-Zoom lenses are becoming very popular among amateur photographers, who search for an affordable standard-zoom lens, which will replace their KIT lens. We will probably have to wait for an "Sigma 17-50mm vs. Tamron 17-50mm" head-to-head review to see which one has a better image quality overall, but until then, we are customers, happy to see that there is a wide variety of very promising lenses to choose from 3rd party lens manufacturers like Sigma and Tamron.
Sigma and Tamron knows that the alternative is for customers to buy Canon or Nikon own brand standard-zoom lenses, but they also know that the price of those lenses (with a fast aperture and optical stabilization) are very pricey for amateur and enthusiast photographers, and there is higher and growing demand for such lenses in the DSLR market.
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