What really concern me is the overall performance. Most 2nd hand 28-70mm (even look as new) got AF screeching problem. What about the 2nd hand 17-55mm? I have no idea for that. Anyone really try & tested those 2nd hand 17-55mm lens before? Do share if possible.
I rented 17-55mm, its fast...IMHO it better than 12-24mm but the down side is its weight...