I'm thinking of getting a lens in the 360mm range to use for color landscape work. Bellows extension is not a problem. I've heard that some of the older f9 process-type lenses (e.g., the Red Dot Artar) might be good choices. While I've seen these lenses advertised, they tend either to be in barrel or in an older shutter which leaves me worried about reliability. Does anybody have a sense of how feasible it would be to have such a lens remounted in a modern shutter? In terms of cost vs. quality, how would this compare to buying a modern lens?