You all know about the Metabones Canon EF to Nex III adaptor. There have been plenty of reviews on it so I will not comment in detail, other than to say that I am very pleased. It appears beautifully made, the tolerances are nice and tight and I do not regret the outlay. After all, I now have access to my full stable of EOS lenses for my A7 and A7R, including the 85 1.2 L II, 24 1.4 L II, 24-70 f2.8 L II and 24 TS-E.
I have not completed testing and will post more on this topic in the coming weeks, but there is one lens I have taken for a spin in order to set a baseline for the legacy lenses (Canon FDn and Zuiko OM) that I have recently acquired. That lens is the Tokina 16-28mm f2.8, which I bought some time ago to use on my Canon 5D III, in the absence of any decent Canon alternatives. I wanted the best possible across the field performance with as little optical compromise as possible. Weight was not an issue.
At 1kg, this is not a small or light lens, but it is an optical masterpiece. My copy is perfectly centered and I am pleased to report that it is as good on the A7 and A7R with the Metabones adaptor as it is on the 5D III. In fact it is better and sets a standard that none of the legacy lenses can match. This lens has been touted as optically comparable to the Nikon 14-24 f2.8 and, although I have not used the latter, I think this must be about right. After all, this Tokina is just about as ‘good’ as my Canon 24-70 f2.8 II. The Tokina weakens a little towards the long end, and is at its best between 16 and about 22mm. 24mm is a touch less good and 28mm another slight notch down (note: the Canon lens shows the same trait with increasing focal length). Inspecting files at 1:1, performance into the corners is breathtaking. At 1:2 (as you’d see a 37″ print from the A7R) the corners don’t really look significantly worse than the centre… its incredible, but a real tank.
The good news for the legacy lenses is that some of them do not look much weaker than the mighty Tokina at 1:2. A little, yes. Would you see it in print? Yes (a large print), but would it matter much? I don’t think so. I am guesstimating at this stage that A1 prints will be very close indeed and quite possibly no different at all in practice.
Some very good outcomes thus far and I will be back to report them in a slightly more organised fashion. Back soon!