Has anyone try this back with a Speed Graphic 4x5. All I know is that it takes the instant fuji FP100c pack film, smaller that the 4x5, but since the price is a bit cheaper in all ways I am thinking giving it a try.
It fits. It's only a little thicker than a Grafmatic holder. I use one, and I find it to be a fast and convenient way of checking my exposures. Just be careful when loading the film, and when pulling out sheets of exposed film.