To load the camera, you simply slide the back off, pop the take up spool end of the cartridge in, and replace the back. Just like 120 roll film, there is a paper backing printed with frames numbers, which are visible through a cut out in the back. All you need to do is wind on, compose and shoot, the frame number is only for reference, unlike 120 film, you don’t have to watch the backing paper for the right place to stop as the camera does this for you.