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Old Sep 4, 2006, 11:52 AM   #1
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based purely on image quality which is best cause i'm going to buy one soon .thanks
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Old Sep 4, 2006, 6:44 PM   #2
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The Tamron is sharper:
http://www.photozone.de/8Reviews/len...0_28/index.htm
http://www.photozone.de/8Reviews/len...2845/index.htm
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Old Sep 4, 2006, 6:47 PM   #3
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thanks for your help .i have gotten a headache trying to decide .
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Old Sep 4, 2006, 6:51 PM   #4
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That was an easy one especially on a cropped camera
-> It is actually not only sharper but a stop faster than the 17-40L (even at the edges) !
http://www.photozone.de/8Reviews/len...40_4/index.htm
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Old Sep 8, 2006, 12:27 PM   #5
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I have the 17-50 f2.8 tamron and it is wonderful. I was debating to get it or the (sigma 17-70, 18-50, or any of the 24-70 models). In the end the photozone.de review made this an easy choice.

Just make sure that the copy of the lens you get doesn't have any problems. The first one I got was soft probably due to some centering problems of the lens elements. If possible make sure you buy locally so you can easily return it or even test it before you buy (by taking your camera and viewing the images on screen to make sure it's okay).

If you buy online buy from a place that allows you to return it like B&H (bhphotovideo.com).
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Old Sep 8, 2006, 9:21 PM   #6
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i stopped banging my head on the wall and got the sigma 17-70. i quess i lucked out and got a good one cause i really like it. enough that i am going to sell my tamron 28-75 which i thought i would never let go . it is just as sharp if not more so and it gives me the wide end i wanted (even tho my wife says i already have a wide end but that is for another forum)
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Old Sep 9, 2006, 9:32 PM   #7
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Camerageak,* I have the Tamron 28-75 and I really like the lens.* I purchased the Tamron 17-50 but decided to keep the 28-75 because it can be used on a full frame camera. I think that eventually I will have a full frame sensor camera.* I am wondering if the lens will be as good on a full frame.* Time will tell.
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Old Sep 13, 2006, 3:00 PM   #8
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tamron 17-50 f2.8 is really sharp. at 17mm the images are really sharp even at the border.

Vj
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