Originally posted by Arpe Interesting stuff at the bottom of that release
" This lens is compatible with the K20D, K200D, K100D Super and K10D (with Ver. 1.30 or later firmware installed) and later PENTAX DSLR camera bodies. When mounted on other camera bodies, the focus mode is automatically switched to manual.
Developed specifically for PENTAX digital SLRs,** this 17-70mm lens also features PENTAX SP (Super Protect) coating that protects the exposed lens elements and repels dust, water and grease. It also features a Quick-shift Focus System that allows instant switching from auto to manual focus with a turn of the focus ring.
**SDM-only focusing lens may be used with non-SDM PENTAX DSLR bodies in manual focus mode. "