Originally posted by automorphism Part of the subtle autofocus enhancements that exist on other cameras are there because they trickle down from higher-end models. That is especially true for algorithms. Nikon could use some aspects of their D5 development to assist lesser models. That is also true for Sony's work on the A9. Those companies also develop high-end telephoto sports and nature lenses, and work closely to couple their camera and lens systems autofocus. Pentax doesn't have any of that, and probably will not incorporate any radical improvements. Even if hey ever release a K3-II successor, they are going to try and make it appeal to most Pentax shooters, rather than a totally new high-end sports camera with blazing-fast AF-C, which would be a much more expensive camera that almost no one would buy, especially since it would not have the lenses to go with it.
An oft repeated mantra like assumption, yet, the D7100 and D7200 models don't even have true AF-c. They have predictive software that doesn't check to make sure the camera has obtained focus after the initial calculation. That's because their focus confirm is twice as slow as Pentax focus confirm and can't be efficiently used in a tracking system like Pentax's. Assuming that there is a trickle down on models that compete with Pentax's is an assumption, not confirmed by any independent testing that I've seen or know of. While Pentax's superiority at specific distance ranges , in speed of focus confirm etc has been documented, and it has abetter keeper rate in those ranges.
So the trickle down thing is only applicable in much more costly models. Especially true since the faster systems have dedicated processers to handle faster AF and clearing the buffer. Those things cost money. So you can get a better AF system for probably $500 plus...up to $2k - $4 more. But that's pretty much irrelevant to Pentax shooters. If we wanted to pay that kind of money for something most people rarely if ever use, we would have.
My question is will any other system ever provide that fast AF.s that Pentax does with a 55-300 PLM in any model that costs less than $3000. To date they haven't. I actually use AF.s for pretty much everything. And in every system I've checked, except for the Sony A9, all other systems have double the time for focus lock of a Pentax, if you compare their multi-point AF.c to Pentax's single point AF.s. Personally I am far more concerned with focus speed in AF.s. I pretty much ignore all these AF.c comparisons, yet that's all people who complain about Pentax AF.c tracking want to talk about. That's in my shooting a ridiculously small part of what I shoot. I have 7 AF.c tracking taken in the last 5 years, and my keeper rate was 100%. It gets annoying hearing people talk about how Pentax needs to catch up.
Everyone but those shooting Sony A9s, or Canon 1Dx's needs to catch up. Pentax shooters should buy fast focussing lenses and learn better technique. It will save them a lot of bucks. With other systems those faster focusing lenses are quite expensive. With Pentax, the DA 55-PLM is quite cheap, very fast and with 14 elements in 9 groups, so it's a modern design and well corrected and it's good enough to have been selected best in class in at least one magazine.
I get really tired of people claiming other system out performs Pentax, with absolutely nothing to back that up but the opinions of some very biased reviewers. You can always find someone who's shooting style favours one system or another. I'm looking for a little more than the personal opinions of those who have committed to one brand or another.
This is not secret information, it's been explained here on the forum many times. There will always be some who need better than Pentax has to offer, true of any brand, the brand's etiquette has to suit yours, but saying Pentax is at a disadvantage in AF is getting really old. There is for many, more benefit to them in Pentax's faster AF.s and focus confirm, than their is in Nikon's predictive algorithms of in anything but a 1Dx, A9 or a D5/D850 Nikon.
So the question should be, when will Pentax release a model with AF.c comparable to those cameras
at a similar price?
The answer is probably never. The brand is too small to support that kind of performance insanity. A few pros really need it, your rich uncle who buys the best despite being a photography dufus doesn't and it's rich uncles that support those cameras most, not pros.. And unless you're a lot better than I suspect you are, you don't either. The majority of people who can't get images with Pentax AF, simply haven't learned much about cameras.