Originally posted by Murfy doesn't the camera beep and show a little green dot in the view finder if the camera is in focus?
Yes, the beep and green hexagon in the viewfinder indicate that focus has been acquired.
If you are seeing a little green dot, you are not seeing the viewfinder clearly.* In live view, there is a beep and the focus point square changes to bright green when focus is acquired.
Originally posted by Murfy I even think live view does the focus highlighting if turned on.
Live view does support focus peaking (bright outline of the in-focus portions of the frame). This feature must be enabled since the default is Off.
Originally posted by Murfy It even does it on the old manual film lenses I have put on (although those are only center focus) but if it doesn't beep, maybe that could be a clue?
Yes, focus peaking works regardless of whether focus is manual or auto. Where things get a little confusing is in regards to manual focus. When using the viewfinder, the camera will confirm manual focus the same way as for the AF system (beep+hexagon). Live view does not support manual focus confirmation (no beep and no visual confirmation).
For fine control of manual focus in live view, I recommend using focus peaking in conjunction with the magnfication feature (hold "OK" button a second or so). This is only really useful when the camera is on tripod, but is basically the gold standard for focus accuracy on the K-3.
When properly adjusted, you should be able to use the sharpness of the viewfinder image for manual focus. For general shooting this will provide results that are acceptable and should be as good or better than what can be had with the AF system. There are limitations, however, related to both the AF system and manual focus using the stock focus screen. I won't go into them here except to say that at wider apertures, neither will provide consistently good critical focus.
Steve
* When the viewfinder diopter adjustment is correct, the AF bracket lines should be sharp, the active AF point (red dot) should be small and well-defined, the numeric display at bottom should be clearly readable, and the AF confirmation should be visible as a green hexagon (six sides). If this is not the case, adjustment of the diopter may be in order. If you cannot attain a usable adjustment, shooting with glasses on may be an option. If shooting with glasses on does not work, you may need to talk with your eye doctor.