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04-16-2011, 06:35 PM   #1
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Paolo.Bosetti's Avatar

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smc-DA* 50-135mm f2.8 won't focus

Hello,
I have a smc-DA* 50-135 since 2 years. Today it started refusing to focus.
When I half press the shutter button, it starts alternating the focus from infinity down to about 2m and then back again for four times, at a reduced speed wrt what I'm used to see, then the camera refuses the focus.

I tested other lenses, both screw-drive and SDM, and the camera works fine (k-5, fw 1.03). I also tried mangling with different settings, but still the problems remains.

It is that kind of "SDM failure" people is talking about here in the forum? note that the motor actually moves the focus.

Anyone had similar experience before? any advice?

Thanks,
Paolo

04-16-2011, 06:41 PM   #2
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SDM failure is when the motor just stops working. This sounds like it might be something else, since the camera controls when the motor should stop.

Adam
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