Thanks, John. I'm not sure but I think they hook a Nikon D-800 to it.
They are always getting new cameras. I think they have plans to switch to a Canon because of software features that works with the computer monitoring system. The software allows them to ghost a previous image so they can accurately match over time. Some of the studies go on for months. Repeatability is a key requirement for their work. That's why such elaborate camera, lighting and positioning is required.
I had a Nikon D-5200 for a while but sold it and the lenses and replaced it with a Lumix LX7.