http://forums.dpreview.com/forums/re...ssage=20274121
Optical quality seems OK, but fixed f ratio and no AF and no communication between the lens and mount.
Alex - AF has been around for only 20 odd years, how do you think pros managed at sporting events with the older Nikon F and Canon FD lenses? AF is a great bonus, but it is possible to manually focus on fast moving objects with a lot of practice.
Dave