SIGMA SD1 - Manual (Page 119)

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4
Set the D-dial to the Drive Area and press the button to select [Cleaning
Mode] in [ Camera Settings] (P.28).
5
A confirmation dialog will appear by pressing the or button.
6
By pressing
again, the shutter will open and you will be able to see the
image sensor.
7
Carefully blow away any dust from the image
sensor using the blower.
Make sure that the tip of blower does not
protrude inside the lens mount. If the power
supply should suddenly shut off, the shutter
curtain and mirror will close. These delicate
parts could hit the blower and damage the
camera.
8
Once you are done cleaning the image
sensor, turn the D-dial to the
position.
Check that there is no dust or dirt on the dust
protector.
Insert the upper tabs on the back of the dust
protector into the two holes as shown in the
illustration.
9
Push the lower section of the dust protector,
as shown in the illustration, with your finger
until it clicks into position. In order to avoid
any damage, please ensure that the dust
protector is correctly positioned.