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- Name
- paul
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i'm looking to buy a tamron 17-50 lens.anyone know if the 17-50mm f2.8 XR Di II VC is worth the extra money over the SP 17-50mm f/2.8 Di II VC Lens.i know that XR is a Special Glass for Better Performance as i've look on the tamron web site. but in the real world does it make much differences 
