Originally posted by Wheatfield This is going to be an unpopular post but....
The AF specification is to work down to EV-1 according to DPReview. I don't know where they get their info, as the specification published on the Pentaximaging website seems to not mention an EV basement.
Popular Photography's glowing review of the K5 says the same thing. And they note that the camera has difficulty focusing in low light, and still declared it a "champ", and give it a 4 1/2 star rating (out of 5) in their camera index in the back. That rating is usually reserved for Canon or Nikon full frames (the K7 never got more than three 1/2 stars, I think).
Of course, no self-respecting Pentaxian likes the review because it is too positive, and we all know the K5 is a dog. But then, no one liked their review of the K7 because they were too harsh and didn't have high enough standards for their tests.
I think we all should just go out and take photos.