Panasonic DMC-GH3KBODY Owner's Manual page 63

Preparation
[Menu Guide]
[Shoot w/o Lens]
•
When using a Leica lens mount adaptor (DMW-MA2M, DMW-MA3R: optional), set it to [ON].
Set the screen that is displayed when the mode dial is set to
and .
[ON]: Displays the selection screen for the Scene Guide or
the Creative Control Mode.
[OFF]: Displays the recording screen of the Scene Guide or
the Creative Control Mode.
Sets whether or not the shutter can be released when no lens is
attached to the main body.
[ON]: Shutter will operate regardless of the 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.
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