Originally posted by ftpaddict mods please move this thread to the appropriate forum if I screwed the location up.
http://www.sigmaphoto.com/news/news.asp?nID=3471
Quote from this article on Sigma's website:
AF function of Pentax mounts cannot be used with SFX / SF7 Cameras.
Does anybody know why that is?
Besides other explanations given, the exact point of that statement is that Sigma Lenses will not work the AF functions designed for the PZ10-20-1 and 1p cameras that did the "power zoom", "image size tracking" and "zoom colapsing to smalles size when camera turned off" functions.
Normal Autofocus "should" work fine, but as others said, Sigma well stands for SIGnificant MAlfunction, where not all the sigma lenses worked fine with all Pentax AF bodies. I've seen and known of some issues regarding jittery focusing, bad aperture information and such.