I had a class project that involved reverse-engineering a mechanical system.
My partner was taking photos with a point-and-shoot. I offered to take the system (a cordless drill) home to take photos, as I had a setup. Set up flashes and a white backdrop using a roll of newsprint paper.
I used the 85mm f/1.8 with extension tubes and three flashes. Two bounced (ceiling and wall) and one through a shoot-through umbrella. Fine time to find a dead battery in the Skyport transmitter. Now have spares.
