Canon PIXMA MX870 - Manual (Page 465)

Important
Large documents (such as A4 size photos)
that cannot be placed away from the edges/
arrow (alignment mark) of the Platen may be
saved as PDF files. To save in a format other
than PDF, scan by specifying the file format.
Placing Multiple Documents
Allow 0.39 inches (1 cm) or more space between
the edges (diagonally striped area) of the Platen
and documents, and between documents.
Portions placed on the diagonally striped area
cannot be scanned.
Note
You can place up to 12 documents.
You can place up to 4 documents when the
Compress scanned images when
transferring checkbox is selected on the "
General Tab " of the Preferences dialog box.
Positions of slanted documents (10 degrees
or less) are corrected automatically.
Important
The portion within 1 mm inwards from the
alignment mark cannot be scanned.
Placing Documents (ADF (Auto Document Feeder))
Important
Place and align documents of the same size when scanning two or more documents.
Supported document sizes when scanning from the ADF (Auto Document Feeder):
When scanning one side of each document: A5 Portrait, B5, A4, Letter, Legal
When scanning both sides of each document: A4, Letter
Page 465 of 1127 pages Placing Documents