All this talk got me going and now i see someone else tried foam cor as well. I had some 1/2" black foam cor and some 1/4 as well that i threw together in about 2.5 hours tonight. I shot a couple polaroids for the hell of it and it works. I used the dimensions of my shenhao back for a reference, it's 6x6 roughly. The camera has a 75mm focal length.