I am looking at a Mamiya 6MF to puchase to give a whirl and take on an upcoming trip to Costa Rica. I have the opportunity to run a roll of film through it to check the focus of the 3 lenses. Anything else particular about these cameras? I have been researching online of quite a while and it seems that making sure all three lenses are calibrated to th RF correctly would be one of the bigger items to check. I plan on checking them all at infinity and also something 10-12 feet away. Thanks for you help!