Panasonic Lumix DMC-G6 Owner's Manual page 26

Preparation
To attach the lens hood that came with the interchangeable lens (H-FS45150)
1
Align the fitting mark D on the lens hood with the mark on the tip of the lens.
2
Turn the lens hood in the direction of the arrow until it stops, and align the stop
mark E on the lens hood with the mark on the tip of the lens.
•
When carrying, the lens hood can be temporarily attached in the
reverse direction.
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