Originally posted by Lights Could it be that this lens is an attempt to solve two significant problems with video recording.
1. Noisy auto focus.
2. The horrible 'click' every time the aperture changes.
Noisy AF do not only affect video.
I believe that the noisy AF has been one of the major reasons for Pentax struggling to find new users.
Compared to other brands, Pentax DSLR kits have seemed much less sophisticated, so many new used would not consider Pentax because the AF sound.
I believe we have seen the last new Pentax zoom lens released with screw drive AF.