The Image Stabilizer and Focus System do make sound when activated on the EF 70-300 f/4-5.6 IS USM lens
Article ID: ART151020
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Date published: 05/22/2015
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Date last updated: 02/05/2016
Description
The Image Stabilizer and Focus System do make sound when activated on the EF 70-300 f/4-5.6 IS USM lens
Solution
The lens makes a soft noise whenever the lens is focused.
You can sometimes hear a soft hum from the lens. This hum will last for about 6 Seconds unless you are keeping the focus butt depressed or the shutter button depressed half way down.
After the 6 Seconds the same noise that was heard when the focus was activated may be heard again as the image stabilizer shuts down.