SDM in my DA* 16-50/2.8 has crashed and burned. I knew it eventually would...

Started Sep 9, 2009 | Discussions thread
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John Shakespeare Regular Member • Posts: 391
Mine died also, but within warranty...

I had a similar experience. My DA* 16-50/2.8 is optically just fine, and I was really pleased with the smooth quiet SDM focussing. But after about 6 months, it just stopped focussing on the K20D. It still worked fine with screw drive on the *istD. As you also discovered, even with the contacts covered, the K20D won't use screw drive on this lens.

I returned it to the Pentax agent in Finland, and they shipped it on to Germany. They gave me a bit of a shock by acknowledging receipt of a Tamron lens, but on telephone follow-up, they said it was a Pentax.

After about 4 weeks, it returned in good working order, optically unchanged as far as I can tell. The repair note said they replaced the SDM motors, which had apparently failed.

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