I have the Graflok back on my Wista, and I thought it would be very handy for rollfilm adapters, viewing hoods and the many other varied graflok attachments... In practice, I have a flip up hood on it and that's as much as I've used it (but the flip-up hood is VERY useful, and protects the GG) - yet to run a rollfilm through the camera in two and a half years...

Marc!