When you select Auto Detectas the paper setting, the following types of paper size are identified automatically.
Placing vertically: A3, B4, A4, B5, A5 (scanner glass only)
Place the short edge of the original toward the paper feed entrance of the ADF or the left side of the scanner glass.
Placing horizontally: A4
Place the long edge of the original toward the paper feed entrance of the ADF or the left side of the scanner glass.
The sizes for the following originals may not be detected correctly. If the sizes are not detected, set the size manually on the control panel.
Originals that are torn, folded, wrinkled, or curled (if the originals are curled, flatten the curl before placing the originals.)
Originals with a lot of binder holes
OHPs, translucent originals, or glossy originals