Summary: I read all the reviews and thought it was a great lens considering the low price. However, my experience with this lens has been extremely disappointing. In fact, after trying to get better pictures, I tried over a period of several months to take corrective action.
Summary: I tried this from 47th street direct - somehow I thought it broke my body and I went into a panic. I switched to the factory lens and matched the focal length then did an MTF comparison between the two with a 5.4 degree diagonal 10% - 90% brightness transition.