These were supposed to be rolls of fewer than 36 exposures. To my surprise, I discovered I had redscaled a Kodak film into one of the Solaris cartridges. I had ordered prints for these and the redscales were printed half from each frame with a large black line in the middle. Have had this before with non-standard film and it sucks.
Cartridges of 135 format film with less than 36 exposures.