Canon EF 70-200mm f/4L IS USM Lens makes too much NOISE with IS on

Started 5 months ago | Discussions thread
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vanvu200904
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Canon EF 70-200mm f/4L IS USM Lens makes too much NOISE with IS on
5 months ago

My EF 70-200mm f/4 goes quietly when IS switch is off but does make quiet a lot of noise and fails to lock on the object when IS is on. Does anyone have the same experience?

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