I've mentioned elsewhere that cinematography is not my profession. So I need some help regarding an A & R VSU A 16 SR, 25 fps. Here's one I found on eBay:
I'm assuming it's a speed control. There's a knob next to the cord, that says A 35 BL, A 16 SR, and A 16 BLEQ. I presume these are the cameras the unit works with. On the other end is a toggle switch that reads 'Cam. Ref.' and 'var.', and a button. The face has a rheostat dial marked 10 to 70, with additional 5-unit marks at either end. A pair of clamps is on the back, presumably to attach the unit to a tripod leg.
So what exactly is this, and how is it used? I don't have an Arri SR, and I have not tried to plug it in anywhere on my Aaton LTR.