Patrick S , Oct 28, 2013; 11:58 a.m.
There are numerous considerations for old lenses. Modern AF DSLR cameras do not, typically, have anything but a ground-glass type focusing screen. Some of them have focus assist indicators which let you know when you're in focus. The bigger thing for older glass is the crop factor. Your 50mm is now a 75mm. If using legacy glass is important to you, you may want to wait and buy the Sony a7. With an adapter you'll get full-frame coverage from your older lenses, as well as focus peaking to assist focus.