The motor failed in my DA* 50-135, twice. Both times it went from being slow to focus to being glacial to focus, then to needing a hand focussing, and finally purely manual focus.
I'd second the suggestion to clean the contacts on both your lens and camera body. Use a dry microfiber cloth, and also try some contact cleaner on a swab if you have that. Make sure you get all the contacts. The KAF2 mount has a whole slew of them, some flush on the ring and some recessed inside the ring. On Mon, Dec 16, 2013 at 6:57 PM, Igor Roshchin <[email protected]> wrote: > > > I have a question for those people who had SDM (or in general, lens > chip) failed and replaced. > > I see that with one of the SDM lenses my K5 has the aperture and speed > settings rapidly (as in crazily) fluctuating. (And the focus shows "MF", > regardless of the focus selector position.) > I was wondering if this is one of the symptoms of the failed chip or > that could be for a different reason. > > When I had a previous chip failure, I didn't see anything like this. > When the chip failed in your lens, did you see this type of a > fluctuation? > I wonder if could be something else that happened to the lens. > > Igor > > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. -- -bmw -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
