This is becoming an annual tradition!
Sent this lens in to Pentax Canada about this time last year, and they:
- Replaced Motor
- Replaced PCB
- Replaced Gear Plate Assy.
The SDM has failed again; the lens cannot autofocus at all, on K20, K5. Tried leaving it attached to a powered on camera for a while, no luck.
I think I'm going to ask Pentax for a whole new copy of this lens; are newer units any less likely have SDM autofocus failure?
My other SDM lenses are OK so far. Wish Pentax would allow the lenses to be used as screwdrive in case of SDM failures.