Announced at PMA2007 and released near the end of that year, the 200mm f/2.8 DA* is the third version of this telephoto prime released by Pentax since 1984. The DA* incorporates the latest technology available from Pentax, most notably the SDM (''Supersonic Drive Motor'') autofocus system, bringing it on par with other major manufacturers.
The 200mm f/2.8 DA* is a designed-for-digital lens, offering a 300mm equivalent field-of-view when mounted on a Pentax digital SLR camera. You may see some hard vignetting if you try to mount it on a K-mount film SLR. It also doesn't have an aperture ring, common for newer lenses, so your film body would have to be able to set lens apertures to work correctly.
The 200mm f/2.8 DA* is available for around $1,000. The lens comes with an enormous circular-style lens hood, and takes 77mm filters. Read the whole review here.