Forum: Pentax SLR Lens Discussion
02-05-2017, 03:14 AM
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I don't have this lens, but do have others with SDM/screw drive, and have never experienced this problem.
My understanding of the QSFS is that it operates through a clutch, and as such surely it's not intended to lock the focus mechanism?
The OP says he's been through 5 copies of this lens, and has had the problem each time. I've not read any other similar reports, so at the moment the common factor seems to be the OP, or possibly the bodies the lenses have been attached to?
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