SIGMA SD1 - Manual (Page 45)

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SHUTTER BUTTON
The shutter button of the SD1 cameras has two positions. When you press
the shutter button halfway, the camera’s autofocus and Exposure Systems
activate. When you press the button “all-the-way down”, and the shutter will
release to take a picture.
TIP
•
Before you start to take pictures, we recommend that you operate the
camera, to become familiar with the halfway position and other features of the
camera.
z
Normally, if the card is not inserted in to the camera body, it is not possible to
release the shutter. If you would like to release the shutter without a card,
please set from [
Camera Settings] (P.28) → [Release without Card].
Disable
(Default)
When the card is not inserted in the camera body, it is not
possible to release the shutter.
Enable
It is possible to release the shutter, even if the card is not
inserted in the camera body.