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10-27-2012, 04:38 PM   #1
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any experience with sigma 18-50 or tamron 17-50

hi all

does anyone have any experience with sigma 18-50 or tamron 17-50?
quality?

thanks

10-27-2012, 05:23 PM   #2
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I have the Sigma 18-50 f/2.8-4.5 OS HSM, and I also have the Tamron 17-50 f/2.8. I like both, but I love the Tamron. It is my most used lens.
10-27-2012, 06:24 PM   #3
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Several forum users have checked in - here for Sigma (several lenses to choose from) and here for the Tamron!

I also used the f/2.8-4.5 Sigma for a while; the 52mm filter size of the DA18-55 WR was more compatible with other lenses in my bag so I went back to it. Fun to have a zoom lens that doesn't change size, and the silent focus was nice too.
10-27-2012, 08:42 PM   #4
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I have the Tamron and quite like it. It is a nice step up from the kit lens. I use the f2.8 a lot and it is quite sharp. Focus seems pretty quick and accurate.

10-27-2012, 09:12 PM   #5
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I had the older Sigma non-macro version. I liked the IQ but sold it for focal length reasons.
10-28-2012, 12:51 AM   #6
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I had the Tamron 17-50 for a Canon 20D. Good IQ but noisy focus..if you are shooting at a quiet event it can be embarrassing. I also found that it hunted a bit, but that may be attributable to the older camera. For bang for the buck, it's hard to beat. I tried a friend's Sigma 17-50 HSM on my K5 and loved it, but it is also a bit more expensive. Tamron also has a pretty good warranty with their products (I think 6 years?) so that's another plus.
10-30-2012, 12:48 PM   #7
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The Tamron 17-50 likely had noisy focus on Canon because it had its own focus motor. On Pentax the body is doing the focusing rather than the lens, and while it's not silent, I definitely have other lenses that focus more loudly.

I'll second the other opinions here...it's a good lens. If you look at the test charts out there it's supposed to be sharper than the assorted Sigma 18-50 versions, but not quite as sharp in the corners as the new Sigma 17-50.

My copy did require a -5 AF fine adjustment but otherwise has been quite good.
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