I have a Pentax K-F2 camera. Lens is a smc DA 18-270mm ED SDM. This is an auto-focus lens with hyper-motor in the lens and no mechanical focus-coupler to the body.
I have seen a tele-extender by Pentax: smc Pentax-F 1.7X AF adapter. it is not clear if it will convey the focusing information from camera to lens or if I will lose the auto-focus feature. Any information is welcome.