But I have a nit to pick. It's either 135 film or 35mm film. The film is 35mm wide, 135mm would be huge, much bigger than medium format (aka. 120 film, 61mm wide).
Probably 135mm focal length on the lens?
Could be, but 135 mm is in the range of typical portrait lenses. Not tele enough for sports, unless they got really good seats.
Film and baseball games go great together