I have just printed this Rittreck 5x7 film back for my camera, I have the 4x5 film but wanted to see if this would work. Its not my design, it was on Thingy Verse made by Hawkeyes0v0. I made the ground glass from 3mm acrylic sheet and sprayed with frosting spray. This view is with a 360mm lense fitted, I have just ordered some film and a film back to try it out.