Originally posted by Biff it's low light capability, now is taking heat for it, relative to the new cameras, but practically speaking for most I bet it's pretty good. No?
The K-5 performs adequately in low-light. But note that it is not always the mere lack of illumination that may cause problems for camera AF - the bigger issue may sometimes be lack of subject contrast, or a host of other scene conditions. For example if you were shooting a black-and-white chessboard in very dark conditions, you may have a easier time with AF than if you were shooting a small white kitten in front of a grey wall under the same dim light.
I think if you are curious about how the K-5 performs in low-light, browse a thread like UnKnownVT's '
K-5 in Use' thread. He shoots extremely low-light with the K-5 all the time, for example, and extensively discusses his experience doing so.