Sigma 18-250 autofocus problems

Started 4 months ago | Discussions thread
OP Mike WW New Member • Posts: 14
Re: Sigma 18-250 autofocus problems
1

A follow up since it would appear nobody knows.

I bought a syringe off Amazon, non medical, but small and 99% rubbing alcohol.  I squirted it up by the focus ring.  It loosened up the rubber zoom band so I took it off and found I could squirt some down there.  I worked the zoom and focus ring a bit, squirted some more, worked it some more then let it dry.  Smooth as butter.  I never really saw anything get flushed out, but it made a world of difference.  It "feels" as smooth or better than new and autofocus works again.  I used 99% alcohol because I didn't want water in there which is relatively slow to evaporate, unlike the high test alcohol.

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