Get one of the novoflex, better made adapter. The metabones speedbooster seem to be good but the others seem to be hit or miss. My own experience...
- Nikon G speedbooster to Fuji was good
- Leica m to Fuji not good. I needed to shimm the adapter because infinity was off replaced w/ a Novoflex. Good fit and infinity was spot on. If u scale focus u need to have infinity spot on.
However, novoflex does not make a wide range of adapters. For example not contax g adapter. I just ordered a metabones contax g adapter. Anyone's guess which way it will turn out, but I liked the new bigger focusing knurl the metabones has compared to other third party adapter makers.
I hear the adapters that camera quest is selling are also good.
Gary
Novoflex makes a healthy range of adapters ...
NEX-A7 body to Canon FD, Contax/Yashica, Hasselblad 6x6, Leica M, Leica r, LTM, Pentax/Praktica M42, Mamiya 645, Minolta AF/Sony Alpha, Minolta MC/MD, Nikon F, Olympus OM, Pentax 6x7, Pentax K, Visoflex II/III, and T2 lenses.
They just don't make some of the oddballs, like Konica Hexanon, Contax G, etc. For those, I'd look for Rayqual (CameraQuest sells Rayqual and Voigtländer adapters) and Kipon. Both of these makes are almost on par with Novoflex quality. There's also Rin Jong or R. J.., a lower priced Chinese manufacturer who sells OEM to a lot of different vendors. Cirrus is another good name. I've had good luck with all of these.
But I stick with Novoflex for the Sony A7 first because I only really need a Leica R adapter for the vast majority of what I do with the camera (although I also have a Nikon F and Leica M mount), second because the quality is there, consistently and reliably, and third because I can use the ASTAT/NEX tripod adapter with all of them, which makes putting the camera on a tripod much safer (loads are all on the adapter, not on the camera's somewhat weak base plate and tripod mounting). It balances better too.
Metabones, which is much ballyhooed on various sites, have been very inconsistent and disappointing. I exchanged a NEX for Leica M adapter twice, and returned the third. First was too tight to fit the A7 body correctly. Second fit the body correctly, but fully half my lenses could not be made to lock on the flange. The third fit both ends, but too tightly on the lens side ... and then I found that it was over-length for the mount registration which made infinity focus impossible. Sent that one back and ordered a Novoflex NEX/LEM ... fits perfectly, precisely.
Might as well get the good stuff once and not worry about it.
G