With the modern day new mirrorless cameras like the Fuji X-T2 and the Sony A7-II, there’s great fun in finding less-than-usual lenses in abandoned lens mounts, and adapt them to fit the camera of your choice.
There’s a lot of adapters available for peanut prices if you want to try something exotic and this article lists a lot of options to get your lens and camera connected.
Don’t forget to get a bunch of macro rings to add between camera and lens if that is your thing!
In this article I try to compile a comprehensive guide to adapting lenses to various types and brands of cameras and lens mounts. As you will have found out by now (or you wouldn’t be reading this article), most camera manufacturers used their own, proprietary lens mounts to make sure that once a customer (that means you) bought into a system, they’d be hooked forever.