The Sigma 10-20mm F/4-5.6 EX DC HSM lens offers an ultra-wide zoom solution to digital cameras, and was exclusively designed to suit the characteristics of digital SLR cameras. The super wide-angle capability of this zoom lens (equivalent range of approx. 16-32mm when used with a Canon digital SLR camera (*) makes it a very powerful tool for both indoor and landscape photography.
DC lenses are exclusively designed for digital SLR cameras. The image circle (rear of lens) is made to match the smaller dimensions used for the image sensor on digital cameras. As a result, these lenses are also more compact and lightweight, and are better matched to digital SLR cameras.
(*) Not suitable for 35mm film SLR cameras or for any digital SLR camera with image sensor bigger than APS-C size, e.g. 1D series or Kodak Pro SLR/c.
EX lens series denotes excellence of engineering and new technology
Correction for various types of aberration provided by three SLD (Special Low Dispersion) glass element and two aspherical lenses
Equipped with the silent, responsive and high speed Hyper Sonic Motor and provides fulltime manual focus override
Minimum focusing distance of 9.4" (24 cm) at all focal lengths
The IF (Internal Focusing) design offers smooth and fast autofocus and non-rotating filter attachment
This review is from: SIGMA 10-20mm F/4-5.6 EX DC Wide Angle Zoom HSM Lens for Nikon
Pros: Very clear , well built lens as to be expected from sigma. Takes amazing landscapes and weather happenings (lightening).
Cons: Only con I have found is getting used to how wide the lens is... Was very annoying at first.
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Excellent Wide Angle
This review is from: SIGMA 10-20mm F/4-5.6 EX DC Wide Angle Zoom HSM Lens For Canon
Pros: Excellent wide angle lens. My shots make me look like I actually know what I'm doing now. It's a very fast lens and uses high quality glass. Every bit as nice as the Canon equivalent and a few hundred $$$ less expensive. What's not to love?
Cons: Mine was delayed (not through this merchant) because of the tsunami, though that's entirely understandable and I was willing to wait.
Other Thoughts: If you need scenery shots, this should be your next investment. People talk about it being too heavy, but there is a lot of glass needed to make these type of shots work. What do you expect? As far as I'm concerned its not heavy either.
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