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A choice between 2 lens: Tamron 17-50mm F/2.8 Di II LD or Canon EF-S 15-85mm f/3.5-5.6 IS?

A choice between 2 lens for my XSi: Tamron 17-50mm F/2.8 Di II LD or Canon EF-S 15-85mm f/3.5-5.6 IS?
I presently have a kit 18-55 and a nifty fifty f1.8 in my bag. My longer focal needs are served by an inexpensive Sigma 70-300mm 70-300 f/4-5.6


I prefer Tamron AF 17-50mm F/2.8 XR Di-II LD SP ZL Aspherical (IF) Zoom Lens for Canon Digital SLR Cameras http://www.amazon.com/gp/product/B000EXR 0SI?ie=UTF8&tag=digitsy-marina-20&am p;linkCode=as2&camp=1789&creativ e=390957&creativ

Canon EF-S 17-85mm IS lens review

Full review at www.cameralabs.com : A four minute video tour around the Canon EF-S 17-85mm IS zoom lens by Gordon Laing, Editor of Cameralabs.com ...

Canon Lens EF-S 17-85mm IS USM VS EF-S 18 ...

Canon Lens EF-S 17-85mm IS USM VS EF-S 18-135mm IS Two almost identical EF-S Image Stabilized lenses with a few minor advantages to each lens ...

Canon EF-S 17-85MM f4-5.6 IS USM Lens disassembly

How to disassemble a Canon 17-85mm to replace a defective aperture unit.

Canon EF-S 17-85mm f/4-5.6 IS USM

my 2nd hand zoom lens

Canon 17-85mm f4-5.6 usm EF-S lens Sharpness test

dombowerphoto.blogspot.com www.bhphotovideo.com and the 15-85mm link www.bhphotovideo.com