One of my clients is Fotodiox, a manufacturer of kerjillions of camera accessories and lights. A big part of my job is dealing with cutting edge gear, but a lot of the time I get to indulge a bit of retro geekery; putting old lenses onto new cameras. Reusing old glass is easy, and often pretty cheap. The lens adapters don't cost that much, and the lenses often are nickels on the dollar compared to their original prices.
Most of my work is in video, and recently I picked up a Black Magic Pocket Cinema Camera which features a "Super 16" sized sensor. The micro four-thirds lens mount is easy to adapt to a variety of lenses, so I just had to try out some 1950s Bolex lenses, and other found optical treasures using a simple C-Mount lens adapter.
We created two videos - one is a primer on the concept of giving classic lenses life again on a new camera. The second is a video essay of some footage we got shot through a thrifted C-mount lens. If you'd like to pick up a C-mount lens adapter of your own, you can get one for under $15 HERE.