Canon 3749B002 On-Screen Manual page 105

Load the original WITH THE SIDE TO SCAN FACING DOWN in an appropriate way according to the
number of originals.
Load only one original
Load the original at least 0.4 inches / 10 mm away from the edges of the Platen Glass.
Load two or more originals
Place two or more originals at least 0.4 inches / 10 mm away from the edges of the Platen Glass
and at least 0.4 inches / 10 mm apart from each other.
(A) 0.4 inches / 10 mm
Note
The Skew Correction function automatically compensates for the originals placed at an angle
of up to approximately 10 degrees.
Slanted photos with a long edge of 7.1 inches / 180 mm or more cannot be corrected.
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