Canon’s $11,000 200-400mm f/4L lens is not something you take apart lightly. (In fact, the full official name is Canon EF 200-400mm f/4L IS USM Lens with Internal 1.4x Extender, but we are trying to keep it short). But that is not to say that it can not be taken apart.
Canon’s youtube channel published such a lens being pilled apart piece by piece and to make it more interesting they do it with a stunning stop motion movie.
The description says it is made from “hundreds of precise mechanical and optical parts” but does not say how many hundreds. It just seems like a lot. Adn we get to see them all stripped from the lens