[mcpherrinm]

Dithering is something done in software; not in the camera (well, camera firmware could do it for you). I'd just get a modern camera and apply filters to get the aesthetic you want. You can take a look at the output of several dithering algorithms on the Wikipedia page:

https://en.wikipedia.org/wiki/Dither#Algorithms

Floyd-Steinberg is a reasonable first choice if you want to implement one. There's pseudocode on its Wikipedia page too: https://en.wikipedia.org/wiki/Floyd%E2%80%93Steinberg_dither...