Originally posted by roentarre AF-C bugs me too. I like the shot with the duck on the way to take off to the flight across the lake.
One more happy customer
AF-C is okay when you have a lens that has fast AF. I use it quite often with my FA*300/f4.5 and mult-focus point focussing, it works well with birding if you don't try to shoot flying birds in an expanse of plain sky! However with my Tamron 1.4x TC it slows down too much and the AF-C is a pain.
I expect it will truly come into it's own with the new SDM lenses.
With certain lenses (usually longer FL's and smaller apertures, i.e. DA 50-200 at 200mm, FA 28-105 at 105mm and Tamron 70-300 Di at 300mm) I have found that the AF is much quicker getting 'focus lock' with SR 'off' in low light scenarios (about EV 4 or less).
If you find your K10D hunting in low light, try it without SR. I know it almost defeats the object somewhat, but at ev 4 you should be using a tripod anyway! But just be aware of it. Steve Jacob has confirmed that it's the same on his K10D as well as mine, so it's unlikely to be an isolated case.
With SR off it is as quick and positive as my MZ-S which is still the best focussing Pentax SLR I've had to date. In reasonable light SR seems to have little or no effect on focus lock.
For a table of exposure values look here
Exposure value - Wikipedia, the free encyclopedia