Originally posted by DSims I'm not sure what some posters are talking about - my K-5 now focuses in virtually no light (e.g. with the lights off, with light only seeping in from the next room through the doorway)! Focus appears better on all my lenses. Note that only one of my lenses is SDM - the DA*50-135. It's plainly focusing using only the light from the AF assist beam - something it had trouble with before.
It will be great if they make other improvements in the future, but this (the AF) is probably the most important fix they could have made right now.
My K-5 has always focused perfectly in virtual darkness, so long as the AF-assist light comes on. In fact, I don't think I've had an out-of-focus shot if the AF-assist light comes on. The issue seems to be in the light range above the level which triggers the AF-assist light, but below 3-4EV. It is in this range where the K-5 will quickly lock, just not properly (FF).