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Forum: Pentax DSLR Discussion 03-19-2017, 09:06 AM  
Pentax, autofocus and the future
Posted By leekil
Replies: 287
Views: 22,101
Correct, I absolutely meant the screw-drive lenses.
Forum: Pentax DSLR Discussion 03-18-2017, 03:02 PM  
Pentax, autofocus and the future
Posted By leekil
Replies: 287
Views: 22,101
The AF tracking issue is possibly not as bad is it is made out to be; in general on Pentaxforums, I have seen the recommendation of the use of non-screw drive lenses for tracking purposes, based on the claim of more granular movements to better follow small focus changes due to subject motion. But most kit lenses are screw drive, so that may be the first experience that people have with the Pentax tracking. Nikon, Canon, etc. have had silent focusing lenses for longer, which uses what is described as the more accurate focusing motor style. So it may not be as much an issue of the camera algorithm, as it is the lens technology being used. Catching up in the lens department, as well as getting the more accurately-focusing lenses out as kit standards may be the more necessary step to rehabilitate Pentax's focusing reputation.

This series of articles describes discovery & testing of Canon autofocus using newer lenses on new bodies, vs. any other combination, and how that is necessary for more accurate focus. The third article reveals that this lens-camera synergy had been developed/discovered quite a while ago by Canon, but it took a while for the product development to catch up:

Lens Rentals | Blog
Lens Rentals | Blog
Lens Rentals | Blog
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