Wouldn't work - where would the USM motor get power from? (not all AF cameras have power zoom contacts, and those are the only contacts that supply power on K-mounts)
On Fri, Mar 24, 2006 at 10:47:35AM -0600, Gonz wrote: > Or they could just have the shaft go into a simple sensor that > controlled the USM. > > > Steve Jolly wrote: > >P?l Jensen wrote: > > > >>If USM is included it means that it won't AF on older bodies. > > > > > >Couldn't Pentax use an automatically-disengaging clutch (like they use > >for manual focus on most of their newer AF lenses) to couple the > >old-style mechanically-coupled AF to a new USM system? That way it > >wouldn't slow down the USM system when it wasn't being used. > > > >S > > -- > Someone handed me a picture and said, "This is a picture of me when I > was younger." Every picture of you is when you were younger. "...Here's > a picture of me when I'm older." Where'd you get that camera man? > - Mitch Hedberg
