>>4300341This was the description from another one that I saw for sale. Obviously not a one of a kind and no I didn't pay anywhere near $2k, closer to $100. The actual lens stops a couple inches rearward of the second flange (the further forward one with the rod sticking out is the aperture control), bolted to that flange and extended backward is a series of PVC pipes glued together and a focussing helicoid scavenged from another lens (all work of the previous owner).
