Originally posted by JeffJS I understand the old habits thing. I've never been thrilled with the AF-C on my other cameras for such a purpose, and as a result, I rarely use it. The reason I'm asking. I'm impressed enough with the High ISO capability of the K5 but I want to know if I'm going to be Completely happy with it (once they are back in stock).
I understand.
I'm pretty happy with the high-iso performance of the K5 so far. I'd say it's a good two-stop improvement over the K7, although I haven't done any specific tests to try and quantify that number (just from fooling around with it for a day, iso6400 on the K5 feels pretty close to iso1600 on the K7).
As for the AF-C, I'll try and get out tomorrow and use it some more and see what the results look like. Obviously I'm hoping for the best, but for me (personally) the improvement in high ISO performance was enough to get me to replace my K7 with the K5. A more competent AF-C would be icing on the proverbial cake.
Also, for what it's worth, I can attest to the fact that the AF itself is quicker with the K5 than the K7 (in terms of locking time). The AF seems more decisive and there are fewer "micro-corrections" at the end right before it locks. This was true for both screw-driven lenses and SDM lenses.