This came with some other stuff I bought and I would have loved having one when I had my studio camera. So, maybe someone else out there can use this thing.
9"x9" outside measurements. It has 2 connectors, so you can use the packards with one or 2 cyclinders with it. The front hole opening is 6x6 so could easily convert to holding 2D boards there with a couple of small wooden rails around the inside edge. Rear circular opening is about 3 1/4" in diameter. There is black tape around it instead of paint to keep it black, and that needs replacing probably. I pulled some up on the side so you can see what I mean.
No idea what to price it, so will say $50, but if that is crazy, make me an offer... Looks like it would need a large flat rate box for shipping. Thanks, Richard