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09-29-2010, 11:43 AM   #1
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How good is Sigma 18-50mm DC OS HSM (non-macro)

I'm considering a cheap replacement for my kit lens. I can get a good deal, I think, on the Sigma 18-50mm DC OS HSM (non-macro) but am wondering how much of an improvement it is on the standard kit lens that come with my k2000. I heard good things on the Sigma's, but the lens review section isn't so clear as to which 18-50 is which. Anyone have this lens? Is the extra stop to 2.8 worth it? Is it 2.8 throughout or just at 18mm?

09-29-2010, 02:38 PM   #2
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You seem to be conflating two different lenses: the 18-50 f2.8 (which has neither OS nor HSM), and the new 17-50 f2.8 OS HSM. The former is cheapish (slightly cheaper or the same price as the Tamron 17-50), but I'm afraid I don't know how good it is. The latter is not cheap (about 600 here in the UK) but its Photozone review (in Nikon mount) suggests that it is very good indeed.
10-01-2010, 09:07 AM   #3
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This was the lens I'm considering. It says OS/HSM. All my fast glass lenses are at longer focal lengths. The forum lens review section isn't so clear which Sigmas are which!

18-50mm F2.8-4.5 DC OS HSM - Standard Zoom Lenses - SigmaPhoto.com

Amazon.com: Sigma 18-50mm f/2.8-4.5 SLD Aspherical DC Optical Stabilized (OS) Lens with Hyper Sonic Motor (HSM) for Pentax Digital SLR Cameras: Camera & Photo
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