I think they and wonder precision jewels made when cameras were wonderful precision instruments, but there are some fair warnings about them. They are great for 50mm and less convenient for anything else. If you wear glasses, they may not be the best choice for you. And they are really old so expect that you'll need it serviced before it is reliable. BTW, I started with a FED2 and now have a Canon P+M2 mostly because of the glasses issue. The good news is that if you buy one in decent condition (KEH?) and works, you can always resell it for what you bought it for.......pretty low risk. I'd say try it and either enjoy it the rest of your life or sell it and find something else you can be happy with.