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Sigma 17-50mm f/2.8 EX DC OS HSM DEAD OS???

Started Aug 28, 2014 | Discussions thread
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Toua80
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Sigma 17-50mm f/2.8 EX DC OS HSM DEAD OS???
Aug 28, 2014

I can clearly hear the OS activate and deactivate on the sigma 70-200 OS and when OS activates, I see a slight shake looking through the view finder. Ii can barely even hear the OS on the 17-50 and sometimes I don't think i can even hear it.
I hear a sound that is probably the OS when i turn the camera (D5100) off.. normal?

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Nikon D610 Nikon D750 Sigma 70-200mm F2.8 EX DG OS HSM Nikon AF-S Nikkor 50mm f/1.8G
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