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11-30-2019, 02:05 PM   #1
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DA50-135 only focusing in one direction

Anyone else had this failure and fix? My DA50-135 just started only being able to focus from close to far but not from far to close. The SDM motor clearly still works but something is causing it to only be able to move in one direction under its own power. Manual focus still works.

11-30-2019, 02:54 PM   #2
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That's what my DA16-50 would do before the SDM finally died. It did this off and on for months before if completely died. I found removing the lens and reseating it would sometime alleviate this issue. I had my SDM motor replaced once and the new one didn't last six months. Converted over screw drive and have had no issues ever since.
12-01-2019, 10:04 AM   #3
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Update. It clearly was some sort of mechanical issue as the SDM could drive the lens in one direction only and when set to autofocus manual adjustments worked like a ratchet also only going one way. I just mounted the lens on my MZ6 to see how it would work as a screw drive lens. After playing with that for a minute I mounted it back on the K-3 and it worked properly with the SDM focus. I wonder if there is some lubricant that has stiffened that the SDM couldn’t break free of but the screw drive could. Or if there is some slider in a slot that got into a position the couldn’t be moved from without more torque. In any case I will have to wait and see.

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