That is quite a collection of glass. would be impossible to track anything in that configuration. COULD GET sequential shots though. I Nice display of glass, but more than I could ever carry or afford.
as all lenses are pointed in the same direction and some of them are manual (means pre-focused?) , and i see two cords on the right must be remote release cables - it very possible the guys is trying to get simultanious picture of something at different focal legnthes. maybe a suttle lanch or something like that?
He can't be very comfortable with about 40 pounds worth of lens and camera over his right shoulder, about 15 pounds hanging from his left shoulder and at least that much though likely much more hanging from his right shoulder. Some of those vest pockets look full too.
It is funny ! ON the other hand could it be a sales rep displaying five different lenses so that potential buyers could see the difference . It appears there are papers or tags that might have a description of the products . I may be stating the obvious and embarrassing myself OH WELL !