Originally posted by Rondec I guess the question to me is whether your first frame is in focus. If it is, then I find the camera does track decently. If the camera doesn't lock accurate focus on the first frame, then all bets are off as to what will be in focus after that.
I'm not much of an action shooter, but I found this to be the most important thing with any of the Pentax DSLRs early on. If you get an initial lock on the subject, AF C will do a reasonable job of tracking. Each model from the K10 to the K-3 got better at this than the previous model. Also, as subject gets closer, AF will naturally have a more difficult time keeping up due to increasingly thinner DOF
and longer focus throw per distance change. You might try stepping back with a longer lens and stop down for deeper DOF.
Scott