I love vintage manual focus lenses. I'm actually in the process of writing a three part article just about vintage lenses. They are cheap, they work excellently, and they're built better than their modern equivalents. In short, they are one of the best investments into photography gear you can make. My most recent purchase is a Canon 50mm f3.5 Macro lens for the old FD mount, and this is my review using it with Fujifilm cameras.