Well, I had an interesting trip to one of the local camera stores today! Saw on their site they had a sigma 400mm f5.6 auto focus lens for k-mount, listed it at $69 bucks. Well, I was there when the opened! When I asked for the lens, turns out they were ready to write it off. Auto focus doesn't work. Aperture communication doesn't work. Aperture ring works though, and the optics are great (body of the lens looks like it was hung on someone's backpack for a decade or so though!). Long story short, I parted with $10 bucks; here are some first attempts: <a href="http://picasaweb.google.com/lh/photo/gfb_EsFnGlAscewzds_9rg?feat=embedwebsite">http://lh6.ggpht.com/_HmFO4R4ztlk/S-cxsFc6bvI/AAAAAAAAB0g/EYuaRdUBrCE/s800/P1010014.JPG" /></a> <a href="http://picasaweb.google.com/lh/photo/912QUlas0bNHwo0zkcz5Ig?feat=embedwebsite">[img]http://lh5.ggpht.com/_HmFO4R4ztlk/S-cxu0L-qRI/AAAAAAAAB0k/n64fUzqCSgs/s800/P1010015.jpg" /></a> <a href="http://picasaweb.google.com/lh/photo/UpGCc0mmLo65VxJnZu8dqg?feat=embedwebsite">[img]http://lh3.ggpht.com/_HmFO4R4ztlk/S-cxyFhTG2I/AAAAAAAAB0s/08YWN0R4g2E/s800/P1010022.JPG" /></a> <a href="http://picasaweb.google.com/lh/photo/O4OXX5090U9ZU0Ygl8vVOg?feat=embedwebsite">[img]http://lh6.ggpht.com/_HmFO4R4ztlk/S-cxwjr0YoI/AAAAAAAAB0o/wPBGCWQmQZg/s800/P1010016.JPG" /></a> <a href="http://picasaweb.google.com/lh/photo/Yly_O916AT9byQ0QsWsxYA?feat=embedwebsite">[img]http://lh3.ggpht.com/_HmFO4R4ztlk/S-cxzRr69rI/AAAAAAAAB0w/XCR6HyhKF3E/s800/P1010025.jpg" /></a> Best $10 bucks I have spent in awhile! These were all taken out on a walk just by our house. Used a monopod for all but the portrait oriented shot above, and they are shot at f5.6, like I said...first attempt! I think this lens might get relegated to tripod-only, but I am happy with the results so far, especially at the equivalent of 800mm!