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scrappydog wrote:
I have the Metabones T IV v0.48. I recently tested out five lenses on a couple of shoots: 24-70/2.8 II, 70-200/2.8 II, 100-400 II, 400/5.6, and 500/4 II. I mostly shot in bright conditions (I noticed that conditions can impact AF performance). I used Flexible Spot AF and shifted between S, M, L through my shooting sessions. Generally, I kept the focus area in the middle. Those results are below. When I moved the focus area off-center, the lenses hunted endlessly, so I ended up sticking to center point/recompose for most of my static shots. This was only the second time I've used the A7RII, so I am a newbie with the system.
My observations:
24-70 II: super fast AF, very accurate AF, no issues at all.
70-200 II: super fast AF even in very low light, very accurate AF, no issues at all.
100-400 II: hunted a lot at longer FLs (much better at shorter FLs), but if the lens was nearly focused, it locked on and stayed locked on very quickly in continuous mode. I used this for BIF with some good shots. It slowed down and hunted more in low light than faster lenses (e.g., 70-200/2.8 II).
100-400 II + 1.4x III: I did not notice a difference in performance compared to the 100-400 II alone, including when used for BIF shots.
400: I only tested this briefly in shady light. Fast and accurate.
500 II: fast to very fast AF, very accurate AF. Occasional hunting. It was a little like the 100-400 at 400mm at times in that if the lens was nearly focused, it acquired focus very quickly and stayed focused in continuous mode with a moving subject. Generally, it is faster than the 100-400 at 400mm, which I suspect is due to the f/4 maximum aperture (vs. f/5.6 for the 100-400 II).
500 II + 1.4x III: I did not notice a difference in performance compared to the 500 II alone.
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Hi scrappydog , very useful info  question, have you tried the 70-200 II with the 1.4x III ( or the 2x iii if you own it ) ?
is it similar to the 70-200 ii alone? my debate is between that one with a TC or the 100-400II
i own the sigma 150-600 C and i used with the Commlite EF-NEX adapter and it worked very similar to your experience with the 100-400 II , i hoped that given the A7Rii sensor i might be similar with an excellent 400mm rather than a "very good" 600mm (and have better AF of course)
any comment is appreciated
thanks
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