Microscopy is great fun!
I did these many years ago with an old Sony video camera and a trinocular scope I got on ebay yonks ago. I have a much nicer Nikon one now, but have struggled to get better results to be honest. I think I need to get a better camera adapter.
https://www.youtube.com/watch?v=387acfSMEtU
https://www.youtube.com/watch?v=bmqieOpfGZo