Ok, so I couldn't resist. I picked up a "Kodak Projection Anastigmat f:4.5 161 mm " lens. I figured, what the %@$# it's only a buck! So the Fstop ring is kind of loose, and the screw that holds it in place, seems to turn without much resistance. On top of that, there looks like there are spider webs inside it. As well the very rearmost element had a sort of darker (darker than clear) halo around it. So for a buck I have a fun little toy, to play with on my desk. However, as a learning experience, and since it is only a buck, what do I have? And what are the steps and techniques to learn/practice to fix them. I assume what I think looks like spider webs is fungus. I have heard this is killed by direct sunlight, how much and how long? Can this lens be taken apart or is it cemented together? I can look through this at something in fairly clear focus, then flip the lens around and it stays in focus, does that mean it is symmetric? Are there shutters big enough to hold this? I don't have my calipers here with me, but it seems pretty big..