Please excuse me if this has been answered already. I recently bought a standard Polaroid back and also a quadra 4x5 Polaroid back for my Mamiya RZ67 II. I am new to shooting instant film but am very interested in experimenting with it. This leads me to my question; does anyone know if there is a definitive list of compatible films available on a website for these two backs? I am aware that Polaroid have ceased manufacturing their film but that some stocks are currently still available and the; http://www.the-impossible-project.com/ may remedy this, who knows. I also saw that Kodak discontinued their version of 4x5 quickload but that Fuji still make their film. Anyway, is there somewhere that I can go to find a compatability list for these two backs or is it just a question of finding bits and pieces of information from different sources? I found one good website here; http://www.gwdigitalandphoto.com/support.cfm I appreciate any help in advance.