Heading to Africa (Botswana and Zambia) for a few weeks and debating what to take for a photography kit. I have an A7R and a number of FE lenses, including70-200 FE zoom. The drawback to the A7R is that the autofocus performance is just "ok." I was thinking of renting an A7II or A7S. The A7II apparently has much better autofocus than the A7R; the A7S has superb low light capabilities, which worked wonderfully for me on a trip to India last Fall in difficult lighting conditions, and I will be out early in the morning and late afternoon and even into the night in Africa. I could take the A7R as a backup and keep my 24-70 FE zoom on it. I am also thinking of leaving the 70-200 FE zoom at home and renting an A mount long zoom with an adapter. A Sony 70-400 zoom, a Sigma 50-500 zoom or a Tamron 150-600 zoom. I may be wrong about the need for such a long lens as I am staying at camps where the safari dirves can go offroad. I also don't know how well such a long lens will work off a tripod. I am hoping that a beanbag setup will work in the safari vehicles.
TIA for any advice. The advice I got last Fall here recommending the A7s for India was excellent. (A portfolio of my photographs from India is now up on my website.)