I'm considering getting one of these bad boys for my NEX camera because I miss shooting my my EF 50mm/1.8 and my Tamron 17-35mm/2.8-4.0 Viltrox EF NEX Camera Lens Ring Mount Adapter for Canon EF to Sony NEX Mount US | eBay The Tamron was super sharp and I actually placed 1st in a school photo contest with it. I loved that lens on my Canon T1i and it was on for about 75% of the time. The Nifty Fifty is dear to me because I got it from my best friend. I'd love to use it with my NEX to show that I still care about that particular lens. I currently have a 28/50/85 setup with my MD lenses and I'm lacking in the WA department. I can't find a decent WA lens on a MD mount except for the Tamron 17mm/3.5 which cost about the same price as the adapter. The Tamron 17-35mm would look like a monster compared to the F3, killing the ultra-portability aspect (It's as big as a 17-40L but not as heavy due to it's plastic material). But it's such a sharp lens... Also, I kind of miss having autofocus. MF gets a little cumbersome. But then again since Sony and Canon have two different focusing systems I doubt it's going to focus well. Should I pay for the EF-NEX adapter or go with the Tamron 17mm/3.5?