I beg to differ, my dear DigiMatt.
Actually the film used to shoot movies was 35mm, yes, but not the same kind as the one used on 35mm cameras. The 35mm motion pictures film has a black coating on the back of it, impeding regular 35mm labs to develop it. It would leave a grease black sediment in the tanks. This film is also not balanced for daylight, it is tungsten balanced. Don’t ask me why. It comes in 100 foot rolls. back in the day, there was only a lab, in Hollywood, Florida, who bought large amounts of left overs from that film from the movie industry and offered prints, negs & slides from their customer’s rolls. They gave customers new rolls of their film in return. I don’t know if they still exist.

Started out doing photography at the age of 6 using an uncle's old 1940 kodak brownie box camera. At 15 years of age, I decided to buy my very own 1975 Praktica SLR camera. I now shoot with a Nikon D850. I do unpaid TFP and commercial paid work.