Originally posted by baro-nite There's also warranted criticism, of any system. The trick is figuring out which is which.
The trick is repeatable scientific measurement.
How does Pentax AF-C compare to other brands? - PentaxForums.com
Anyone posting personal opinions without scientific support in rigorous testing can be taken with grain of salt. Their opinion is to be trusted only at your peril.
And ignoring the internet clickbaiters.
In the following chart...
The Pentax K-3 captures 14 images using AF.c tracking, tops in class tied with 2 others. It actually confirms my own shooting with a K-3. Tracking my dogs running towards the camera, the Pentax is very strong on the mid range images, before the dogs get closest to the camera. In the 4th , 5th, 6th and 7th frames, Pentax beats every camera tested. IN other words, it's better tracking than the 7 other cameras tested in that range. It's not as good in other ranges, but the range for the first 8 images is close to even the best. That has always been my observation, but i didn't have numbers. In the last 6 images as the subject gets closes to the camera the Pentax doesn't do as well, also confirmed by my own experience.
Thinking back on my own experience, as the test chart suggests, I don't think I've ever missed a mid rage shot using Pentax AF.c tracking. Once it locks focus, it stays locked, until the motor that drives the AF in the lens is unable to move the focusing elements fast enough to keep up, which is why fast focusing elements are critical to AF speed, when tracking.
Here we have the repeatable numbers in a test designed to be impartial, they aren't what everyone on the internet is claiming. The question now is, will the nay sayers start talking science, or continue to spout ignorance.
We have had to rely on anecdotal reports, because there was very little science available. That excuse is gone. From here on, your ignorance is on you.
It should be redundant to point out how much nonsense has been posted on this forum by people who didn't know any better. Perhaps now folks will be able to see them for what they are. Opinionated people with little regard for the accuracy of their statements, and acting without any science behind them. They are content to just repeat the imagined criticisms of other brand's fanboys in their evaluations, or base their conclusions on side by side shooting with shooters from other brands, when it's they themselves and their techniques that are the weak link, not the camera.
My complaint with Pentax is the speed of the burst with AF.c turned on, not the AF performance or acquisition rate. And even that doesn't affect Pentax's performance in the above tests, It still go off 14 frames, tops in the test.
And what's with the Fuji XT1? It got off 9 frames while the best got off 14. That would drive me crazy.