Panasonic LUMIX S5IIX Operating Instructions Manual page 253

Drive / Shutter / Image Stabilizer – [Shutter Type]
[AUTO]
Switches the shutter type automatically depending on the recording conditions and
shutter speed.
[MECH.]
Records with the mechanical shutter type.
[EFC]
Records with the electronic front curtain type.
[ELEC.]
Records with the electronic shutter type.
[ELEC.+NR]
Records with the electronic shutter type.
When pictures are taken at slower shutter speeds, the shutter is closed after recording
to perform long shutter noise reduction.
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