For anyone who is interested the quote, "....opaque to ultra vioet light and this obviates the need for a UV filter" comes from the Pentax commissioned book 'Pentax ME Super book of Photography'. The current Pentax website seems to have downgraded this claim to,"reduce ultra violet". Here is a link to where I read it.

http://www.pentaximaging.com/camera-...uct-highlights

Dave