Ricoh seems to be very proud of these new AF algorithms, especially the ability to accurately track a subject moving directly towards the camera (a longstanding weakness of the Pentax AF system). It sure looks like we have, for the first time in the history of the K system, an intelligent, fully-predictive subject tracking system that is on par with (or at least a close match for) Nikon's 3D Tracking AF. I hope to see some tests soon...
—DragonLord
---------- Post added 04-23-15 at 11:24 PM ----------
The AF tracking issue was brought up in this thread a few months back:
https://www.pentaxforums.com/forums/6-pentax-dslr-discussion/281403-dear-pent...ion-means.html Originally posted by Nicolas06 For the Z-axis, being precise is as important (or more) as being fast. Problem is Pentax K3 track but do not predict. When you predict you move the focus continuously direct to where the subject will be when you take the photo.
When you track you just recognize that the object is focus is the same as previous frame, you compute the shift to be in focus currently and order the lens to do it.
For sure, you need to be much faster because you are always late and because the subject continue to move. In particular there always a time between when you trigger the shoot and the shoot is taken. Something like 1/10s of second. Nikon advenced bodies (D7100 for example, but I would say not D610) know the exact time and estimate the object speed in all directions. So it know that in that 1/10s the object would have moved say 1m (that's already 36km/hour, as fast as world wide running champions) and they move the focus accordingly.
You don't need that much speed out of a lens to move it by the focus 1meter only (except if the subject is maybe 2m from you) because the change in focus is really small.
This is software computation, not hardware and K3 doesn't do it.
For sure, very fast lens will follow more accurately than slow lens but they'll never be as perfect as even a moderately fast lens but precise lens with predictive algorithms.
[...]
The new AF sensor and metering sensor are new. The first body to use them is the K3. The metering is same level as highest high end Nikon body. AF sensor has no as many points but except if you try to track a very small object, this should not be the limiting factor. Agree that covering a wider area with maybe 50 AF sensor would help.
Still what miss is the algorithms. Before the software team had no chance to make them, the hardware was not here. Now they developped the basics to get tracking. Tracking in reality for me is following subjects and finally is just choosing the right AF point in the grid and let the AF sensor does it job as usual. Predicting is knowing in advence the right AF point but much more importantly predict the focus distance in advence. This is mostly for movement in Z axis. What you complain is not yet good.
For this, Pentax just need to improve their software. It is very likely that without any special effort (maybe 1-3 engineer working on it full time on software side for the next body) that they get that fixed.
It looks like Ricoh has listened and gave the AF.C algorithms a much-needed overhaul. This would not have happened while Pentax was under Hoya ownership.
Ricoh, thank you for paying attention to your customers' feedback!
—DragonLord