At F/2.8, the lens is showing a lot of vignetting :

http://www.pbase.com/nadeauf/image/1106 ... iginal.jpg
Correct with Light room (maximum setting):

http://www.pbase.com/nadeauf/image/1106 ... iginal.jpg
At F/8.0

http://www.pbase.com/nadeauf/image/1106 ... iginal.jpg
Those are pictures from this morning, I have been able to meet my friend in the afternoon, and we have took pictures from Canon and Sony, I will update my first posting with the picture information later.
But, for the price, and when you know how to handle the Tamron SP, this lens can be good. But at F/2.8 you can only trust the center
Regards,
Frank