Hey guys. I'm getting a polaroid back for my Bronica off eBay soon so that I can take some test shots to make sure my metering is correct. But I'm a little confused on what kind of polaroid film I can use. There is a lot of film on eBay, but is there a special type of film that I need for medium format photography? What is the best kind of polaroid film for the buck? I don't need great film since it's just for test purposes. Thanks.