I'm getting a 35mm adapter for my video camera and I have an option to choose which lens mount I want. Here are the choices. Canon FD Canon EF (EOS) Nikon AI Pentax K Minolta MD Along with two film (movie) camera lens mounts PL and Oct19. Which mount should I pick base on variety and price. I would like a nice variety to choose from but don't want to end up breaking the bank on them as I will be getting a few, possibly 3. Also, where do people get their lenses from? Adorama, Ebay, BH?