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DL stands for Drop-in Loading. It's a Fuji exclusive feature that simplifies the process of loading a new film into the brand's cameras. The film is placed in the camera after pulling out a bit of the leader, and then the back of the camera is closed. The film is automatically fed until the first frame.
This function is often associated with prewinding, meaning that when a new film is inserted, it is fully taken out of its cartridge and stored in a compartment. The film is gradually reintegrated into its cartridge after each shot. In case of accidental opening of the camera, the already exposed part of the film is always protected. At the end of the film, there is no need for rewinding since it is already in the cartridge. One can simply open the camera without fear of accidents.

In the early 1980s, Fuji filed numerous patents related to the loading process from both mechanical and electronic perspectives. One complexity involved the length of the leader extending from the film cartridge. In a typical film loading process, the user must slightly pull out the film, insert the tab into the receiving spool's slot, and correctly align the film perforations with the sprockets. The Drop-in Loading system eliminates all of these steps. Various solutions were considered, such as placing the cartridge in the back of the camera, loading from the bottom (similar to Leica), etc.

Fuji Photo Film Co. Ltd. filed a trademark application for DROP IN LOADING on November 12, 1982. It expired less than two years later.

Patent No. JPS5868730 relates to the film guiding in easy loading and was issued in 1983.	Patent No. JPS57169736 pertains to the easy loading system and was granted in 1982.
Patent No. JPS57201221 is associated with the easy loading system and was granted in 1982.	Patent No. JPS5870218 is related to loading in the back and was granted in 1983.
Patent No. US4586801, granted in 1986, is associated with the prewinding process.	Patent No. US4885599 Algorithm for Pre-winding (1989)