Originally posted by One3rdEV After all that is what this thread is for... refreshment for those of us thirsting for more feedback.
I got my K-3 III a week ago and the first thing I wanted to check out was how it performs together with my F*250-600/5.6. I have used this lens with K-7, K-5, K-5 II and K-3. When I got my K-3 in 2013, it was really a big dissapointment and frustration that it didn't focus properly with this lens. About 25% of the images was unusable because the focus was either a little bit in front or a little bit to far away. K-3 wasn't precise enough. So the last 7 years I have used my F*250-600/5.6 with my K-5 II only.
With K-3 III this is going to change. K-3 III nails focus almost every time. It is certainly better than my K-3 and also better than my K-5 II. When it doesn't nails it, it is because of other things like me or grass/branches in the way and so on.
The picture is taken with the K-3 III and F*250-600/5.6. It was starting to get dark and the exposure was 6 seconds with f5.6. K-3 III focused fast and without any adjustments 2 or 3 times afterwards as we Pentax users know so well. When I look at this picture at 100% in lightroom, it is as sharp as it can be :-)