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Product Description
The Sigma Corporation is pleased to announce the launch of the new 18-50mm F2.8 EX DC MACRO lens. This 50mm macro lens has a large aperture of F2.8 throughout the entire zoom range, a minimum focusing distance of 20cm (7.9..) and a maximum magnification of 1:3, making it ideal for close-up photography. Specially designed to suit the characteristics of digital SLR cameras this lens provides a high level of optical performance. Its design incorporates both glass-mold and hybrid aspherical lens technology which offers extremely high image quality as well as a compact and lightweight construction. Minimal vignetting and superior peripheral brightness is ensured. Special Low Dispersion (SLD) and Extraordinary Low Dispersion (ELD) glass elements provide excellent correction of color aberrations. The super multi-layer lens coating reduces flare and ghosting, a common problem with digital cameras. High image quality is assured throughout the entire zoom range. An inner focusing system eliminates front lens rotation, making the lens particularly suitable for using the petal-type lens hood (supplied) plus circular polarizing filters.
Customer Digital SLR Lens Reviews
The only things I didn’t like are that its not internal focusing (but that’s something I can get used to) and, every once and a while, it will take its time autofocusing. Sometimes, the slr lens will not allow the shot to go at all! Its not that much of a pain and is something you can deal with for the versatility and the price!
After learning to love prime lenses, it was time to replace the underwhelming kit lens of my Rebel XT with better quality glass. I looked long and hard for a fast zoom that covered the wide-to-medium range despite the XT’s crop factor, and finally settled on the Sigma.
Although I haven’t laid my hands on the competition (including a similar 17-55mm f2.8 EF-S from Canon for more than *twice* as much, and the slower 17-40mm f4L), I don’t regret my purchase at all. I was a bit wary at first about buying a non-Canon lens, especially after reading a few complaints online about bad samples, but the lens turned out to be just fine.
Edge-to-edge sharpness looks great to me, even wide open, and vignetting doesn’t seem to be a problem. I’m not a professional, and don’t own any L-series glass, but this sigma 18 50mm is far more than I expected for the price. The macro ability is also a nice bonus, as is the lens hood and case included in the package. I wouldn’t call the lens “lightweight” (since I still prefer small primes when I don’t need the versatility), but it’s still a reasonable fit on the diminutive XT body.
I’m not crazy about the slight sparkle in the powder coat, but hey, that’s hardly a complaint. All in all, I couldn’t be happier!

















































