Canon PowerShot G6 User Manual page 183

3
If you use the built-in flash when the lens hood is attached, a
portion of the flash will be blocked by the lens hood and appears
dark.
If you use the viewfinder when the lens hood is attached, a
portion of the view will be blocked by the lens hood.
When you are not using the lens hood, it can be stowed as
shown in the illustration below.
Attach the hood by aligning the
mark on the rear of the hood with
the mark on the adapter and
rotating the hood until the hood's
mark aligns with the adapter's
mark.
To remove the lens hood and adapter,
hold down the ring release button and
turn the adapter in the opposite direction
shown.
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