Originally posted by Albert Siegel The folks at Ricoh/Pentax know the limitations for speed, which is why they are moving to KAF4 for all their high-spec lenses going forward. They can't achieve a very high FPS with a mechanical aperture. The KAF3 and older designs are limiting the speed of what they want to do in the future.
This is another reason they will not relaunch old lenses.
How reliable are your informations?
The K-3 delivers 8,3fps, which is more than any non-PLM Pentax lens AF drive can follow precisely. I don't see the need for KAF4 now, at least not for speed.
When AF processing units and algorithms can compete with Canon&Nikon and the new generation motors of future lenses can archive the AF speed of their CaNikon counterparts, then electronic aperture could be the next thing.
What do you mean with relaunch old lenses? THere have been rumors about exactly this. Don't know if it's also an official interview content, since they're hard to check one by one.