Panasonic Lumix S1R Operating Instructions Manual page 171

The electronic front curtain type reduces blur caused by the shutter because the
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amount of vibration from the shutter is small compared to the mechanical shutter
type.
The electronic shutter type allows you to record without vibration from the shutter.
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0 When [ ] is displayed on the screen, recording will be with the electronic
shutter type.
When a moving subject is recorded using the electronic shutter, the subject
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may appear distorted in the picture.
When you record using the electronic shutter under lighting such as
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fluorescent or LED lighting, horizontal stripes may be recorded. In such a
case, lowering the shutter speed may reduce the effect of horizontal stripes.
0 When [Silent Mode] is being used, [Shutter Type] is fixed to [ELEC.].
When using APS-C lenses, [EFC] is not available.
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You can register functions to Fn buttons:
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[ ] [
(l 278)
] [Fn Button Set] [Setting in REC mode]
7. Drive/Shutter
[Shutter Type]
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