This website mostly goes through detail on how digital cameras work and how they use digital camera technology, but it introduces the topic of discussion with how film cameras work too. Therefore gives a bit of depth to both parts of the essay, but also goes into a bit more detail on the digital side.
This eBay URL defines some advantages of using film cameras in the current digital age. But as well as this it describes the structure of each part of a film camera.
This online magazine briefs us on the process of light entering a film camera, from what’s happening inside to what the film is actually made of. The extract is written by Team Jugaad at Jugaad Magazine.
This website discusses more specifically how celluloid cameras work, first going through light, lenses and exposure and then going on to discuss film sensitivity vs light sensors and more.
This website discusses the material used in celluloid film and the chemical reaction that happens upon it when filming, and how this creates a number of static images that turns into one moving image.