Remember that for many purposes you want a frame a size larger than your camera. For platinum I started with a 4x5 camera and got an 8x10 frame from Bostick and Sullivan. When I went to an 8x10 camera I wanted an 11x14 frame from B&S. Bill Schwab made a frame for 7x17 that is 11.75" x 21" over all. The paper and brush strokes are larger than the negative. Good luck in your venture. Nothing like beautiful hand made wood work.