Panasonic Lumix DMC-GH2H Operating Instructions Manual page 135

[SENSOR CLEANING]
•
Dust reduction function will operate automatically when the camera is turned on, but you can
use this function when you see dust. (P177)
[SHOOT W/O LENS]
•
When using a Leica lens mount adaptor (DMW-MA2M, DMW-MA3R; optional), set it to [ON].
Dust reduction to blow off the debris and dust that have affixed to
the front of the imaging device is performed.
It is possible to setup so the shutter will not operate when there is
no lens on the unit.
[OFF]: You cannot press the shutter button when a lens is not
attached to the camera body or is not attached
correctly.
[ON]: Shutter will operate regardless of the lens on the unit.
Recording
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