SCANVIEW ScanmateF8+ Operator's Manual page 18

General operating procedures
Focus calibration is rarely necessary, but should be done at the time of
installation and can be repeated later if necessary.
For instructions on both types of calibration, please see "Scanner
Calibration and Focus Adjustment" in the ColorTrio Operator's Manual.
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ScanMate F6 / ScanMate F8 Plus • Operator's Manual