04-14-2011, 07:01 AM
I had a Tamron 70-300 VC USD for a couple of days together with a D90. Sharpness of this lens was mostly poor, only say 1 out 10 shots was OKish. VC and USD appeared to be working though. However, I found in the Exif data that using the Tamron yielded substantially different subject distances compared to those I got when using another lens in the same setting. In other words, something was very wrong...