Canon imageCLASS MF5850dn Basic Operation Manual page 107

Scaling Documents
3
Select output size of the document from
[Output Size].
The document is scaled automatically according
to the settings made in [Page Size] and [Output
Size].
4
If you want to increase or decrease the
magnification manually, select [Manual
Scaling], and then specify the scaling ratio
for [Scaling].
If you specify a scaling ratio outside the allowable
range, printing will not be performed correctly.
5
Click [Print].
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