Abstract: A flat-bed scanner for scanning an original document, comprising a scanner housing and a scan carriage movably disposed for motion relative to the scanner housing. A sensing system is mounted to the scan carriage for scanning the original document. A media holder supports the original document for scanning along a scan line such that the original document is positioned at an object focal plane of the sensing system. The media holder support system dynamically maintains a portion of the original document proximate to the scan line coincident with the object focal plane during scanning. The support system includes a first mounting device pivotally attaching a first end of the media holder to the housing for allowing a pivot motion of the media holder with respect to the scanner housing and a second and a third mounting device are affixed and movable with the scan carriage for movably supporting the media holder during the motion of the carriage.