I bought a swamp lens. I'd wanted one of these for a while. A Tamron Adaptall 35-70mm f3.5. I found one on eB*y with just 17 seconds left. I bought it without thinking, for next to nothing. Too bad it has an ocean of slop in the focus and a dead insect on one of the internal elements. Still it was cheap and the BBAR multicoating makes it an attractive paperweight...