I have this old lens that an acquaintance gave to me to evaluate for possible purchase. I had a thought it might be interesting to attach it to a modern film or digital camera for a vintage look. But I have little experience with glass this old. The glass is reasonably clean, some dust and light dirt inside, no scratches. Shutter works, such as it is. It's seems un-coated. Naturally, the Zeiss name caught my eye. I have no idea if it's a good lens or not. I can't see any indication of focal length. Was this on a view camera or a folder? What year approx? Any information that can be provided is greatly appreciated.