Originally posted by Hope9811 While I believe audiobomber is still missing my point that I am not saying 'focus & recompose' isn't a valuable technique, but the user needs to understand the limits, it IS time to move on. There are several threads in the Forums where folks blamed the camera in error rather than the technique.
I totally agree about using either AF.S or AF.A autofocusing modes (AF.A will typically use AF.S unless you pick a scene mode that implies action). I suspect there is a bit of back focus, but try turning off continuous AF first. If you do still see the focus point consistently just behind (or in front of) your subject. You will find several tools for checking and correcting mentioned here in the Forums. My personal choice is:
PENTAX DSLRs: Front or Back Focusing Problems? Free test (Lens Alignment) charts for Pentax, Nikon, Canon, Sony, Olympus. And if you use the focus indicators when using a manual focus lens, then yes this affects those lenses too.
You don't indicate a couple things in your data - what exposure mode you used, and what metering pattern you are using. So please forgive me if I am off on a couple of my critiques.
In pictures 1 through 4. Look at the angle of the light. In each case the strongest light is behind the faces. And those areas seem to be properly exposed. Any number of techniques would have improved the photo. The best would have been to put the subjects' faces in the same light as the background - - - okay, moving bison isn't the smartest plan .... so two others might be to switch to spot metering (knowing you will likely overexpose the background) or use a bounce reflector or fill flash.
Here is the good news. Most photo processing software will allow you to tweak only the mid-tone shadows to increase the exposure in the faces without totally blowing out the rest of the scene.
Your prairie dog sentinel is properly exposed - but to me it looks like your camera back focused giving you a sharper view of the dirt immediately behind the subject.
By the way, another way to focus and recompose is to shoot a little wide and crop later. And yes, it has its limits too; you restrict your future print size, but you won't face depth of field issues. There are trade offs everywhere in photography.