K20D double exposure...

Have Pentax K20D with 2 Sigma zooms (10-20mm and 18-200mm). Can access double exposure feature from menu when lenses are not attached, but as soon as I attach either lens the feature becomes inaccessible. What gives??

Seems a bit odd but it could be an issue with the lens/body communication. In the past there have been some problems with Sigma lenses and Canon bodies and the lenses needed to be rechipped. Have you contacted either Pentax or Sigma to see what they have to say?

John...If the lenses work in regular modes with the K20D, I would contact Pentax about the problem. I use Sigma lenses on the K10D and don't have any problem doing multiple exposures.

John, I have the k20d and two Sigma lenses, 28-70 and 70-200. I have made numerous multiple exposures and have had no problems. My best guess would it would be something with the software that should be a Pentax fix.

Contacted Pentax and they indicated that multiple exposure is not available when camera Mode Dial is set to "green mode." I like simple solutions, don't you?