I met with CliffB and 4labs at the carolina Raptor Center today for the annual PhotoWild event. I shot mainly with a D200 and Sigma 150mm 2.8 Macro with TC. For some reason, I had trouble with sharpness...and I don't know why. This lens is very very sharp. I even tested it last night before the event. Nosie was an issue too....lighting was fairly dim, and to keep backgrounds from going too dark, I had to keep ISo up a bit. Oh well....perhaps it was low contrast lighting and the feathers...in any event, this is what I came away with.