bhollis wrote:
Given the differing results, and all the caveats and qualifications we\'re seeing for even the lenses that supposedly work well, I\'m coming to the conclusion that the only way to really know how well a particular lens will work for you is to try it on your A7RII with your adapter and your Canon lens.
Testing this within the usual 1 week EU return period could be tricky; and it\'s even trickier to test a lens that you are planning to buy in the near future (and that you can only test while visiting a willing dealer). I\'m glad I didn\'t rush to buy :-)
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saintiwari wrote:
There is a pattern here. Older lenses don\'t af well. Newer lenses do.
What i can\'t understand is why 100-400 mark II can\'t af?? That seems to be the only lens in Freds list which is new.
Both the 100-400II and 100L Macro are recent lenses that don\'t work (or don\'t work completely). There might be more exceptions coming.
With the A7R it seemed as if the Metabones adapter worked best with recent lenses, while alternatives like Viltrox sometimes worked well with older lenses. It\'s too early to tell what is going on, maybe some older lenses will still work with the other adapters (with some limitations), or maybe the A7RII uses a faster AF protocol that the adapters or the older Canon lenses have trouble handling?
If the adapters are using reverse-engineering of Canon AF protocol and work on the edge of what is possible given the practical limitations of such adapters, it doesn\'t surprise me if the behaviour is erratic, or varies between individual copies.
Aug 11, 2015 at 12:17 PM
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