Crop Prescan option.
Cropped Prescans
Prescans always scan and refresh the entire image area unless the Crop Prescan box is checked. When the Crop Prescan box is checked, only the cropped area indicated in the preview screen will be scanned, which can greatly reduce the overall prescan time. Out- side the cropped area, the prescan image will remain
unchanged. Using the crop mask is recommended with a cropped prescan to disguise the area of the preview that has not been updated by subsequent prescans (see the section on the crop mask for more details).
ViewFinder™ control screen with a cropped preview in effect.
21