Originally posted by jake14mw Everyone is getting so emotional here. I have used Pentax for a long time and I've been satisfied, but I don't make excuses for them either. I'm just trying to get a real understanding of the AF-C performance of the K-1. From what I have read in this forum over the past couple of months, my overall impression of the AF performance of K-1 is that is has taken another step forward, but no great advancements have been made to get close to the AF-C performance of the better Nikons and Canons. The DpReview review of the K-1 seems to paint a very poor picture of the performance. I'm just trying to get a true picture. It seems that biz-engineer has tried to make a good faith attempt at performing a test close to what dpreview did. I appreciate that.
My experience with K-1 and various FA and D-FA lenses is the
tracking AF can be used successfully if the camera is properly set up (AF-C 9-SEL, Medium Hold) and the user assists the camera by actually moving the AF frame to keep the subject covered by the AF points. The camera apparently won't decide what to do
on its own as well some other brand cameras are said to. If I move the camera to keep the subject centered I do fine, I feel.
There are fewer AF points and fewer cross-type, f/2.8 points than Nikon and they're concentrated inside the crop frame, so a fast f/2.8 zoom will be finicky at open aperture, but it can be managed. The tracking algorithm is a generation old, which means a few years ago a similar algo was cutting edge. AF-S, contrary to DPR, is snappy enough for a field camera, and accurate. There's no PDAF face or eye sensing, but that's a new feature of AF.
IMHO they set up a straw man at DPR. They ran action tracking tests which they knew K-1 would fail, failed it, then said the entire AF is Poor.
That conclusion is not supported, and they're retracting it one small edit at a time.
Depending on your use case K-1 AF is either competent or unsatisfactory.