70 mm film came perforated at least two different ways, and non perf.I think you could get it perf on one side too. The school portrait shooters drove most of the business in 70mm, along with some aerial work. I have a 70 mm roundshot that I use and film availability is a problem. The school portrait shooters all went digital, which is why 70 mm film was dropped. Hence all the darkroom stuff on ebay