Figure 1: The K5 has the (35mm film type) Tokina mounted.
I’ve been doing video with the K5 for a few months. I think I’m beginning to grasp some concepts, relating to how this camera can/must be used in order to shoot frustration free video.
For starters, the auto-focus sets only the initial focus when the camera is in video mode. Since targets are moving around inside (and outside) of the DOF, this is a little sub-optimal for videographers. My solution is to focus manually. The K5 is nice for this, using the LV (live view) LCD, because a single press of the info button provides a 2X zoom for focusing purposes, and a double press provides a 4X magnification.
VideoMiscellany 