If you go to Instagram and search #120mm or #120mmfilm right now, and you will find over 740,000 posts by budding and experienced film photographers alike. There’s only one problem: there is no such thing as 120mm film. And a new movement/website is doing its best to set the record straight. This gauntlet has been taken up by our friend Bellamy Hunt at Japan Camera Hunter, fellow sticklers at Emulsive, and, at the center of the battle for truth-in-film-photography, the…