Proper Use

The Canon EF-S 18-55mm f/3.5-5.6 IS II lens is designed to be used with autofocus mode, and it should not be damaged if you turn the focus ring while the lens is in autofocus mode. However, it is not recommended to do so as it can cause the autofocus motor to work harder than necessary, which can lead to faster wear and tear of the motor. If you need to adjust the focus manually, it is best to switch the lens to manual focus mode first before turning the focus ring. This will allow you to adjust the focus without putting any additional strain on the autofocus motor.

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