Yes, I work with electron microscopes (TEM and SEM) looking at biological and material samples.
I started my collection with an old gradeschool microscope from the 50's. I've since added a factory model used in a Zeiss plant, some Japanese field microscope, and a nice Bauch and Lomb from the 30's (that's the big one). I love to find them all dusty and dirty, then take 'em apart and polish every piece before putting it back together. When I'm done, they look brand new again.