Le DL-100 et le DL-20 furent les premiers d'une série d'appareils dont le nom commençait par DL, ce qui signifie que tous sont dotés du système Drop In Loading.

Drop in Loading signifie qu'il suffit de glisser la cartouche dans un logement et que l'appareil fait le reste. Jusqu'alors aucun système de chargement du film n'avait été aussi simple. Certes les cartouches type 110 et 126 avaient simplifié la mise en place, mais l'avancement, le rembobinage restaient des opérations manuelles dans la quasi-totalité des cas. IL faudra attendre l'APS pour retrouver une telle simplicité. Il est également possible de rembobiner depuis n'importe quelle position du film.

L'intérêt des DL-100 et DL-20 ne s'arrête pas là. Ces deux appareils ont été dessinés par un designer italien : Mario Bellini, détenteur de nombreuses distinctions professionnelles. Trente ans après la sortie de ces modèles, le design semble ancien et pourtant, il était innovant à l'époque. Souvenez-vous des Citröen BX, elles aussi sorties en 1982.

Le Dl-100 présente la particularité d'avoir un réglage automatique de la sensibilité s'il est chargé avec une cartouche de film de la marque Fuji (100 et 400 asa seulement).

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)