Question About 70-200mm f4L IS

Started Jan 5, 2012 | Discussions thread
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cheezit Regular Member • Posts: 281
Question About 70-200mm f4L IS

Just got my brand new L lens, however I have one question about the IS:

When I half press shutter button, the IS motor continuously makes the whirring sound even when focus is acquired and image in the viewfinder has stabilized. The whirring is continuous as long as the shutter button is halfway press. It only stops when button is released or shot taken. Is this normal? I have tried IS in every mode but no difference. Thanks for your input.

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