So I went back to the dog park, there were dozens more dogs as it had rained the whole weekend before so I got fewer runs in. However this time I set AF Hold to Medium and the AF was set to Auto-9-Point, it was sunny and I increased the shutter speed to 1/4000th sec, however I forgot to turn SR off which could lead to unintentional blur if one is panning even with a high shutter speed, I've seen it in airshow photos, for a while it leaves you scratching your head and then you realize SR could have played a role (Certainly not always).
Sorry I didn't produce the photo streams this time however the format is the same as the first test seen here
The Ugly Truth About Pentax AF-C (Cuteness included) - PentaxForums.com 1st sequence APS-C mode 18 photos in 4-5 seconds running straight towards me, into shade then out of shade then getting way too close
Ratings (4,2,1,2,4,1,1,1,2,2,1,2,4,2,2,4,4,1)
33.3% Perfect, 72.2% the camera did its job (Combined #1 and #2)
Obviously a weak start to this sequence. The camera managed to track reasonably well when entering the shade, not perfectly but still followed in general, however when exiting the shade the camera hesitated and when it re-locked on it was to the dogs tail and then lost it again until the last shot when the dog was almost on top of me and it managed a shot in focus but by then the dog wasn't able to fit in the frame.
2nd sequence APS-C mode 22 photos in 4-5 seconds not running directly towards me but on an angle and as he gets closer it goes to side on then too close where I'm not able to get him entirely in the frame.
Ratings (1,1,1,1,4,1,1,1,1,4,1,4,4,1,2,4,1,1,1,1,1,1)
72.7% Perfect, 77.7% the camera did its job (Combined #1 and #2)
Obviously the camera tracks less direct Z-axis movement a lot better, however as the dog got closer the cameras tracking started becoming inconsistent but once it locked on confidently again it stayed with the dog despite not being able to keep the dog fully inside the frame.
3rd sequence APS-C mode 27 photos in 5-6 seconds, straight on started in shade for the first shot with a quick transition to sun and back into shade for the last 5 shots but the dog got super close again by that point.
Ratings (1,2,4,4,1,1,2,4,1,2,1,1,1,1,4,2,4,1,1,4,1,2,2,4,4,4,4)
40.7% perfect, 62.9% the camera did its job (Combined #1 and #2)
It seems through several of these the lens would jump ahead then reacquire, track for a bit, lose it and jump ahead then reacquire again. If we were to take out the ending of the sequence to this where I could have stopped shooting sooner it would be more like 52.4% Perfect and 71.4% the camera did its job.
4th sequence APS-C mode 23 photos in 4-5 seconds coming straight at me with an obstruction (another dog) entering the frame part way, despite being on focus hold medium the camera did lose track while that happened.
Ratings (4,2,1,1,1,4,4,1,2,4,4,1,1,1,1,1,2,4,4,4,4,4,2)
39.1% perfect, 56.5% the camera did its job (Combined #1 and #2)
I'd like to point out as in the previous sequence if we take out the bad end we get much better figures 56.3% Perfect and 68.8% the camera did its job.
In total there are 90 photos in 4 sequences, 46.7% perfect and 66.7% the camera did its job. if we leave out those 2 bad endings where I really should have stopped shooting we get 77 photos in 4 sequences, 54.5% perfect and 72.7% the camera did its job. I really can't say Auto-9-Point did any better than SEL33 (Expanded Area 33)
It was interesting to note however that subject transition between sunlight and shade could cause the AF to loose the subject. Maybe this is related to focus hold, maybe its simply a metric the camera has trouble compensating for.
I'm sure I'll post another gallery in the coming days for your enjoyment.