I have run across an interesting article in my internet travels Analog is Not the Opposite of Digital which addresses using the term "analog" for a film camera.
I tend to disagree with the article, and I would like to ask a question about the characteristics of traditional film that would make it an analog medium (i.e., able to respond to a virtually continuous spectrum of light, etc.), so it feels like a signal processing question at its core, but I'm not absolutely sure it fits here. Photography.SE might seem like an obvious choice, but I think that the theoretical perspective/expertise here is more what I am looking for.
I would make every attempt to avoid it being "discussion"y as well, so I think it's safe to assume that it would pass the fundamental test of being a real or constructive question.