Hi Everyone - here is something I found out the hard way. My vintage RF and Ektar 100 are not compatible! The numbers for the film do not line up with the windows on the back of the camera - the number on the film is closer to the top of the camera, and above the window. I have found Portra 400 worked nicely in it. What have YOU found that works and does not work? I sure hate wasting film! Thanks.