Sigma 50-150mm f/2.8 APO EX DC OS HSM Lens *loud noise*

Started Feb 17, 2014 | Discussions thread
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romelman New Member • Posts: 2
Sigma 50-150mm f/2.8 APO EX DC OS HSM Lens *loud noise*

I just bought a Sigma 50-150 f/2.8 OS lens for Canon mount, however I often hear a louad squeaking noise that is different than the normal clicking sound when AF is on.  This only happens when the OS is on.  Is this a defect?

A video is here:

http://www.youtube.com/watch?v=rwnT3lxw-68&feature=youtu.be

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