Actually very good on the A9 especially with the fw 5. I was even getting good results on the Sigma 150-600C, even on the A7RIII. If you can lock onto subject within central zone it will track it using all points, but it won't initiate tracking from the outer points. If you stick with centre or flexible spot large it'll track fine. With the 150-600C I was getting fairly good keeper rate ~ 50%, I epxect the 500 II to be better even with the 1.4x.How is the 500 II on the mc-11 adapter?
Been thinking of renting the A9 to see.
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