I had bought this lens at a vintage camera show back in 2013. I think I paid something like $7 for it. I wasn't sure what I was going to do with it but entertained the idea of using it on a sliding box camera I was going to build. After some research it turns out it is a Bausch and Lomb 15" (380mm) Triplet design, similar to a classic Petzval lens design without an iris. It's aperture is F6.7 and is perfect for portraits on a large format camera 5x7 or larger. It won't yield the crazy swirly bokeh that a F2 Petzval lens will but it will give a nice out of focus background that is smooth and pleasing. The lens dates from around 1916 and was originally used in a Magic Lantern Projector that was used commonly for projecting large slides or glass plate negatives onto projection screens. It's missing the focusing knob for setting fine focus but I can work around that with the bellows focus already on the camera. I took it apart and cleaned it up and now the brass shows through on all the unpainted brass parts, the nickel plated barrel is shiny and all three glass lens elements are in near perfect condition with no scratches. Next, I'm going to strip the black paint off the barrel flange piece, revealing the brass underneath to bring out that classic vintage lens look. The final step will be to mount the lens on a lens board and test it with the 5x7 camera. I really look forward to getting some nice, soft focus portraits looks out of this lens. These lenses sell for several hundred dollars so $7 and a bit of elbow grease was well worth it.