Single 8mm is the lesser-known cousin of the popular Super 8mm format. It was Japanese company Fujifilm’s answer to Kodak’s Super 8. Fujifilm hasn’t made Single 8 film since 2012, though, and there are still a lot of cameras out there.
Jenny List has been tackling this issue by designing her own Single 8 film cartridges. And they’re a drop-in replacement for the original cartridges. Jenny has been documenting the design process on YouTube.