The Pentax brand carries almost no meaning to VAST majority in the US... its become one of the random brands from the past...like Packard-Bell, or what ever the name of the brand of electronics Radio Shack used to sell -- its pathetic.
The website is barely up to date... check out the Lens Compatibility Chart on the site
Pentax Imaging - Lens Compatability Chart
It doesn't even include ANY of the DSLR in the current product line... what a joke.... what kind of image does that portray?
Seriously, Pentax needs to get its marketing act together.