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Tamron 70-300mm f/4-5.6 Di VC Lens Review @ The Digital Picture

"he Canon lens most comparable to the Tamron 70-300mm f/4-5.6 Di VC Lens is the Canon EF 70-300mm f/4-5.6 IS USM Lens. The Canon's advantages include modestly lighter weight, better AF accuracy, less vignetting and less pincushion distortion through 200mm. 

 The Tamron's advantages start with a much better price (with the lens hood included). The Tamron's AF system is nicer with internal-focusing, FTM and no filter rotation during AF. The Tamron has modestly less flare, less barrel distortion at 70mm and modestly less pincushion distortion at 300mm. 
 
 If you need great 300mm image quality from a 70-300mm lens, the Canon EF 70-300mm f/4-5.6 IS L USM Lens is the answer. As you would expect, this huge improvement in image quality, along with better build quality and much better autofocus performance, comes at a price. The difference in image quality between the 70-300 L and the Tamron 70-300 VC is readily apparent in the results. 
 
 The Tamron 70-300mm f/4-5.6 Di VC Lens is available in Canon (reviewed), Nikon and Sony/Minolta mounts. My standard disclaimer: There are some potential issues with third party lenses. Since Tamron reverse engineers (vs. licenses) manufacturer AF routines, there is always the possibility that a DSLR body might not support a (likely older) third party lens. Sometimes a lens can be made compatible by the manufacturer, sometimes not. There is also the risk of a problem that results in the lens and body manufacturers directing blame at each other. Tamron USA's 6-year warranty far surpasses Canon USA's standard 1 year warranty."