I think Nikon made 2 types of cassettes. One for their RF's and Nikon F and another for F2. Not sure what is the difference between them. Price of cassettes in Germany sounds reasonable. If you find some extra I'm interested. Yes, movie stock ORWO is interesting film, not cheap here in North America, more or less in line with Ilford and Kodak. They (ORWO) have necessary equipment to package 135/36ex cassettes but for some reason not interested to do it???