Focus Elevation; Accessing "Autofocus" And "Focus Elevation; Tips For Using "Autofocus" And "Focus Elevation - Scan View SCANMATE F10 User Manual

Scanner calibration and focus adjustment

FOCUS ELEVATION

The Focus Elevation function manually moves the focus point towards or
away from the mounting plate. This function can be used to optically
defocus an image.

ACCESSING "AUTOFOCUS" AND "FOCUS ELEVATION"

The Autofocus and Focus Elevation functions are accessed by clicking on
the Focus & Aperture button in ColorQuartet's Preview Setup window or by
opening the Focus section at the bottom of the Scan Setup window. For
each individual job, you can specify:
• Whether you want to use Autofocus.
• Whether you want to manually change the Focus Elevation, and by how much.

TIPS FOR USING "AUTOFOCUS" AND "FOCUS ELEVATION"

• Transparencies only, emulsion side down: If all the images on the mounting
plate are transparencies and all are mounted with the emulsion side towards
the scanner bed, the default focus found during focus calibration will be
sufficient to produce images with optimal sharpness.
• Different types of originals in the same preview scan: If you are scanning
some transparencies emulsion side up and others emulsion side down, or
if you are scanning reflection originals of varying thickness, use the Auto-
focus function to ensure optimum sharpness for each image.
• Rescreening: The best way to blur existing halftone dots in a printed
original is to use the digital Descreen feature in the Focus section of
ColorQuartet's Scan Setup window. However, it is also possible to defocus
the optical system mechanically. To do this, move the focal point toward
the mounting plate by setting Focus Elevation to a value between 0 and –500.
The value necessary will depend on the original's halftone screen. The
coarser the screen ruling, the bigger the dots, and the more the scanner
must be defocused. You may have to experiment a little to find the most
appropriate levels of defocusing for various screen rulings. Make a note of
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ScanMate F10 • Operator's Manual