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. Still over 50% of my pictures turned-out so blurred and out-of-focus that I put the lens back in it's box and have not used it since.
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. The MTF curves were proof that the lens was truly junk. Often MTF values at F/8 dropped to 30. Wide open the MTF dropped to 18 and was a wavy line.