For Nikon Mount...Most reviews/ groups say that the first version of Tamron's 17-50 f2.8 is the sharpest over the VC and the built in motor version.
For sharpness sake, would you sell your VC or built in motor version to get the 17-50 without motor?
For sharpness sake, would you sell your VC or built in motor version to get the 17-50 without motor?