Canon EOS Rebel XTI - Manual (Page 112)

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Normally, the Self Cleaning Sensor Unit will eliminate most of the dust
visible on captured images. However, in case visible dust still remains,
you can append Dust Delete Data to the image to later erase the dust
spots. The Dust Delete Data is used by the Digital Photo Professional
program (provided) to erase the dust spots automatically.
Get a solid-white object (paper, etc.).
Set the lens focal length to 50mm or longer.
Set the lens focus mode switch to <MF> and set the focus to infinity
(
∞). If the lens has no distance scale, look at the front of the lens and
turn the focusing ring clockwise all the way.
1
Select [Dust Delete Data].
Under the [m] tab, select [Dust
Delete Data], then press <0>.
X The Dust Delete Data screen will
appear.
2
Select [OK].
Select [OK] and press <0>. The
automatic self-cleaning of the sensor
will be performed, then a message
screen will appear.
3 Appending Dust Delete DataN
Preparation
Obtain the Dust Delete Data