Canon PowerShot SX40 HS User Manual page 169

Turning Off the Powered IS Function
Powered IS reduces subtle camera shake when shooting movies at max.
telephoto. However, when shooting while walking, or during long panning
shots, you should set Powered IS to [Off], as it may cause unexpected results
in these situations.
[Powered IS] settings will be disabled if [IS Mode] is set to [Off].
Changing Shooting Function Settings
Choose [IS Settings], then press the m
button.
Press the op buttons to choose
[Powered IS], then press the qr buttons
to choose [Off].
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