Panasonic Lumix DMC-GF6 Owner's Manual page 290

Others
Filters (optional)
The MC protector is a transparent filter which affects neither the colors nor the amount of
light, so it can always be used to protect the camera's lens.
The ND filter reduces the amount of light to approximately 1/8th (equal to adjusting the
aperture value 3 increments) without affecting the color balance.
PL filter will suppress the reflected light from a metal or non spherical surfaces (flat
non-metallic surfaces, water vapour or invisible particles in the air), making it possible to
take a picture with enhanced contrast.
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When using the interchangeable lens (H-PS14042), turn this unit off and ensure the lens barrel
is retracted before attaching or removing a filter.
•
Do not attach multiple filters at the same time.
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You can attach the lens cap or the lens hood when the filter is attached.
•
Refer to the instructions for each filter for details.
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