Upon further testing, I've discovered that my Sigma 70-200 behaves different and the K-3 II might not be all it's supposed to be:
Lens used: Sigma 70-200mm f2.8 Macro HSM
Settings on camera:
1st. AF.C shot: focus priority
Action AF.C continuous shooting: FPS priority
AF hold: off
Results: Horrible - as in utter crap. The first series of photos (link to album down below) sums up the kind of photos I'd typically get.
I replicated this at a later time, with different light and different targets (cars).
Settings on camera:
1st. AF.C shot: focus priority
Action AF.C continuous shooting: focus priority
AF hold: off
Results: Much better results and appear to be better than K-30 - Framerate was obviously affected, which dropped down to (I'm guessing here) something like 4 fps. The second series in the album is an example with these settings.
Click to enter the album:
Upon even further testing here at home, I've currently concluded, that bad focus is caused by bright areas such as reflections and harsh light - but don't think I'm talking about trying to focus on a reflection of the sun on a clear sky or stuff like that - here at home, a tiny reflection on a bottle standing 3 meters away from the lightsource is enough for the focus to blast to another galaxy - and I think the lit hair and shiny stuff on other test shots, forinstance a badge or zippers on bags, on the bicyclists or even approaching cars were the "culprit". It appears that way now that I look at the photos again.
However - the K-30 is not at all like this! and with K-30 I've often locked focus on lit candle lights when the environments has been so dark to be able to use anything else.
More stuff I noticed:
- Camera will fire no matter what shutter release setting I'm using - in both AF.S and AF.C and in single shot as well as burst mode - however, it can refuse if I've been tracking something (been holding AF button down) for a while and then want to take a photo before focus has been confirmed.
- If I track different targets then all of the sudden the focus can get stuck and I'll have to refocus - not a big issue, but really? In continuous focusing mode?
- Expanded AF seems to be as useless as always, though I haven't played with it much. What I've seen so far is the AF point just jumping randomly around, close to original point.
- Nitpicking here: the LCD display would be complete if it was able to see exactly which AF point has been selected and also whether AF point selection mode is on or off.
On the good side:
- I can be on AF.C and whatever shooting mode, hold the AF button, track and do a single shot - and often nail the focus, also while changing targets and taking a pic fast. It was a bit tricky with K-30.
- Low light performance is awesome - this was of most concern to me and the K-3 II delivers. I just tried with my K-30 and the 70-200 at 200mm. The K-30 couldn't lock and gave up on tons of targets. On others, also many, the lens hesitates before it has even started to focus - and then focus all the way out and in again.. and give up. All in all it's very sluggish and frustrating. It will miss targets or refuse to lock focus on stuff you'd think are bright and contrasty enough.
In fact, when I'm at weddings, the 70-200mm is the first lens to get swapped out once the light level starts to gets low.
With the K-3 II however, it's still snappy and I had to deliberately find tricky targets that would challenge the AF, such as my black LowePro bag. I was able to lock focus (properly) sometimes immidiatly and sometimes after few attempts - while focusing on the cloth, not some shiny metal stuff (that's cheating)
I think the fluke with AF is disappointing, but despite this and the camera not respecting shutter release settings, I'm all in all and at present time, still very satisfied - but only because of Focus Priority gives me the shots. If the problem persisted here too, I'd be angry and return the camera. But that's not the case and I'll repeat: I'm satisfied.