One of the big headline features of the A7R II was its vastly improved autofocus system, including over 300 phase detect AF points covering over 40% of the sensor. Upon hearing this news, the first thing that jumped out to me was how would this affect the performance of adapted lenses – which has been very disappointing to this point.
Sony Artisan Thibault Roland had a chance to interview an engineer from Sony, who worked on the A7R project. An interesting note from that interview, which you can find in its entirety here, is the bit quoted below, where the Sony engineer claims that the AF speed of Canon lenses adapted to the A7R II almost match their speed on Canon bodies.
We were confirmed that AF of Canon lenses was “much faster than before. With adapters (and in particular, with a firmware updated Metabones Mark IV) Canon lenses are almost as fast as on a Canon body.
Now, as we all know, just because an AF system is fast, doesn’t mean that it is accurate. But if this turns out to be true, I can see a wave of A7 adopters trading in their current A7 models and upgrading to the A7R II, specifically for this upgraded AF functionality. On the current generation of A7 bodies, the adapted lens AF speed is dreadful. It works, yes, but it’s so slow in most situations that there is little point in using it.
The first signs that this claim by Sony may be true are coming in as well, with videos posts by our own Miquel Quiles and Gordon Lang of Camera Labs showing a vastly improved AF speed on the A7R II.