Canon RF 24-50mm F4.5-6.3 IS STM Instructions Manual page 11

4. Zooming
To zoom, turn the lens' zoom ring.
Be sure to finish zooming before focusing.
z
Zooming after focusing can affect the focus.
Blurring may temporarily occur if the zoom ring is
z
quickly turned.
Please be careful not to let your fingers get
z
caught in between the lens' front and the focusing/
control ring when zooming.
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