I have the above listed combo and I am noticing issues when focusing at subjects far away.
My gear is as follows:
-Sony A7ii running Phase Detect AF ver3.20, IBIS on
-T-smart mk4 adapter running ver0.52 Green mode
With the 17-40, when I'm indoors or focusing on subjects 50m or nearer, autofocus works great and accurate.
AF also works great with my other lenses such as the Canon 85mm 1.8, Sigma 50mm 1.4 non-art, 70-200 F4 IS USM although i do not focus near infinity with these lenses.
However when i go out to a park and shoot and am focusing on backgrounds far away, the details simply turn to mush. I have noticed this on many occasions when i am shooting outdoors with the 17-40 on autofocus.
I have some 100% crop image samples(view flickr for full size images) here there were shot handheld out at Hyde Park, London.
Manual focusing was also done handheld. AF point placed on the water/grass edge.
Anyone knows what could be the issue?
The adapter works fine when focusing at closer ranges so I'm not sure what's the issue here.
And to think on-sensor PDAF was supposed to eliminate any need for AF microadjust!!!!
I will be heading to Switzerland this weekend but it looks like the 5d2 is coming along instead of the A7ii/Metabones.