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Thanks Kev & Mark.  Couple more things ref AFC. I likely mistakenly thought lens AF-Hold locked the AF at fixed distance like in manual focus, so I don't use it on my 2-600 lens.  Because I  reasoned if the bird changes its distance from cam while on lens Hold, it'll go out of focus. So does lens Hold button lock the AF Tracking function or lock the focus at a fixed distance like in man focus?

P.S. Kev - I found that later iterations of a7R cams that Sony replaced the old wheel's center button Tracking Lock with an integrated AF-Tracking lock embedded in AFC. So that old "Standard Focus" tracking system is gone and replaced.