From my understanding both the K-X and K-7 will do contrast focus detection in live view. Live view uses the sensor to focus so it should have basically perfect focus without back or front focus.
Why couldn't pentax create firmware with a calibrate function that would use live view to get the 'correct' focus on a contrasty subject then focus again with the mirror down and apply an offset to correct for the difference? You would basically point at an object with the camera on a tripod and press calibrate. It could do a live view focus, then a 'normal' focus and get the offset and save it.
Last edited by VaughnA; 12-17-2009 at 11:51 AM.