Thanks all. Scott, it's just the 11x14 camera without using the plate holder. The opening is 15.25" square. The biggest pain in the ass was finding a tray for the silver that was big enough for the glass plate while not being too huge for the dark box. I'm thinking of actually making a tray specific for this size as I really love the big square. Visiting that exhibit we were invited to up in Dallas I really enjoyed S. Gayle Stevens big square plates and it inspired me.