Extension Tube Question

[Joseph Tainter]

Does anyone have the Kenko Uniplus Tube 25 for Pentax? The web site 
(thkphoto) says it is designed for autofocus, but doesn't specifically 
say that autofocus lenses can still autofocus with it on.

Does anyone know?

Keeping fingers crossed. This would answer a pressing need for closer 
focusing with my Sigma 70-200 f2.8.

Thanks,

Joe