We're considering including a few days at a game park camp in Sri Lanka early next year, and I see the owner can rent some decent equipment for game drives, including a Canon 600 f4 no less. Does anyone have any experience with one of these adapted to an A7 body? I have an A7S, and might also have an A7Rii by then. I might try it out for myself anyway since I think one or two members of my local camera club have got that particular Canon bazooka. If so, which adapter would people recommend? Many thanks for any thoughts.