Canon BJ-30 - Manual (Page 77)

Chapter 5 Using the Operator Panel 69
One-half Reduction Mode
In One-half Reduction mode, the printer automatically sets the print
dimensions as follows:
Top margin: 0.12 inch
Left margin: 0.85 inch
Print width (max.): 6.8 inches
When using Reduction mode, you must select the correct paper size within
your application. In the example above, you would specify a paper size of
15 x 11 inches in your application. Be sure to account for your margins.
Using the
Operator Panel