Tamron SP AF 17-50mm F/2.8 XR Di-II LD SP ZL Aspherical (IF) Zoom Lens with Built In Motor for Nikon Digital SLR Review

Tamron SP AF 17-50mm F/2.8 XR Di-II LD SP ZL Aspherical (IF) Zoom Lens with Built In Motor for Nikon Digital SLR
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(More customer reviews)
Update at the bottom (04-dec-2009)
I am an event and wedding photographer and first i was more keen to the Nikon 17-55mm f/2.8G but i did my research and even asked in a Wedding Photography group on Flickr and a friend of mine told me that he switched to tamron after he discover the performance was comparable to the three times more expensive lens made by Nikon.
You wont get the metal lens or the internal focusing that comes with the Nikkor one, but to be honest that does not matter that much in a lens this small, it comes out like a bit over an inch when you zoom in but i don't see why that would be a problem to anyone. I shoot events that last for hours and the lightweight is a plus.
I have taken over 3,000 pictures already and they are just perfect. I did a test with both lenses mounting the camera in a tripod and taking the picture of the same subject and i couldn't tell which one was taken with Tamron or Nikkor (not even in my big screen).
The focusing is pretty fast, well suited for fast paced situations such as weddings and concerts where everybody is in constant movement, also very quiet! If you are on budget i strongly suggest you to buy this lens and you wont be disappointed. My copy serial is almost 30,000 so i guess previous issues have been solved. The only problem i have found is that on the wide end (17mm) corners are a bit soft (not too much to notice at first sight) but that doesn't bother me because i use it between 20mm and 28mm most of the time.
Note that i have been using the lens on a Nikon D300 and i take around 500 pictures per event average.
I think it's not fair call this lens "junk" just because you have a bad copy, please be fair. If that is your case ask for a replacement and I'm sure amazon will work things out for you, then make a review based on the good copy.
Isaac
Update 04-dec-2009:
The lens it's been focusing really slow for the past 2 months and even though the focusing speed was OK and a bit noisy the pictures were fine, now I'm going to repair it and then sell it, just purchased the Nikon 17-55mm f/2.8G and wont buy anything from Tamron ever again and stick to Nikkor lenses. Maybe i got a bad copy and i know some of my fellow photographers don't have the money to purchase a 1,400 dollar lens, but if you can do it just don't think of it twice just for the sake of avoid a focusing failure in the mid of a job. If you are just an amateur photographer having fun with the camera, i encourage you to try every lens before spending your hard earned money in something that will just stop working few months later.

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The Tamron SP AF17-50mm f/2.8 XR Di II LD Aspherical [IF] is a lightweight, compact, fast standard zoom lens designed exclusively for digital SLR cameras. The focal length of this lens is equivalent to approx. 26-78mm in 35mm format.This lens offers an f/2.8 maximum aperture throughout the entire zoom range, to ensure stress-free photographic shots at all focal lengths and distances. Additionally, a broader photographic expression through the use of faster shutter speeds as a result of the maximum aperture offers enhanced photographic pleasure.FEATURES:Optimized for Digital SLR - The use of XR (Extra Refractive Index) glass optimizes the overall distribution of optical power, and also reduces various aberrations to the absolute minimum while achieving remarkable compactness. In addition, suitable positioning of two hybrid aspherical elements serves to maintain imaging performance and to shorten and compress the entire optical system.LD Glass - An LD (Low Dispersion) glass element is used to accomplish effective compensation of on-axis and lateral chromatic aberrations, a critical factor for enhancing optical quality in digital photography, in order to achieve outstanding optical performance over the entire zoom range.Enhanced Peripheral Illumination -Peripheral light fall-off is minimized when compared with that of conventional lenses for film cameras, so images are uniformly bright from the center to the periphery.Internal Surface Coating to Reduce Ghosting and Flare -By employing "Internal Surface Coatings" (i.e., multiple-layer coatings on cemented surfaces of plural elements) and multiple-layer coating technology on ordinary elements, ghosting and flare due to the reflections that occur when light enters through the front element and reflections caused by the imagers themselves are reduced to the absolute minimum.Zoom Lock Mechanism -The Zoom Lock prevents unwanted barrel extension when carr

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