I saw one for sale at a local thrift store and was very intrigued. It looked fine but didn't have the slide duplicator. I may get it but I have a few questions that haven't really been answered by my searching though google. Can I used it on my AE-1, with my FD lenses? What lenses can I use? My 50mm f/1.8? Could there be any vital pieces missing from it? How much magnification can I get out of it with my normal 50mm 1.8 lens? Is it worth it to get with the box and instructions for $22?