Sony a7R III to the a7R II a7s AF accuracy and speed with third party lenses...?

haringharing Major grinsPosts: 254Registered Users Major grins
edited December 5, 2017 in Cameras

I am just wondering how fast and accurately the a7R III, to the a7R II an the a7s focus with third part lenses like Canon and Nikon?
Are they usable for wedding? Is there anybody who used these mirrorless cameras for wedding with third party lenses...
Thanks so much!

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