Amazingly, somebody made a functional 35mm film camera out of LEGO, and put it on LEGO Ideas. It needs about 2300 more votes to have a chance of being made into a real set.

https://ideas.lego.com/projects/87367099-a72a-4796-afa7-895a58ed932a

LEGO ZH1 - Working and Functional 35mm Film Camera

📸✨ Introducing ZH1: The Fully Functional 35mm Film Camera Made Entirely from LEGO! 🧱🎞️My primary goal was to create a fully functional 35mm film ...

^{ideas.lego.com}