I've got a Kiev vega 2 submini that I'm planning on using soon. The only problem is I have only 1 film cartridge and also don't know how much film to load into the cartridges. Would anyone happen to know a good source of empty Vega 2 cartridges (I believe they are the 30 frame ones not 20)? and also how long must the film be in them? I can only find lengths for the vega 1, 20 shot cassettes.