I recently got one of those A 24-50mms but haven't tried it on my K-x yet. I'll see if I can give it a go tonight and see if I have the same problem.
Darren Addy Kearney, Nebraska -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.