The present invention includes a servo-shutter mechanism comprising a servo-motor and a first gear rotatably attached to the servo-motor. The gear has teeth. The invention also includes a second gear having a first end and a second end. The first end has teeth in meshing contact with the teeth of the first gear and the second end is adapted to be joined to a cam ring. The cam ring has an aperture and a plurality of pivot pins where one of the pivot pins is joined to the second end of the second gear. Additionally, the invention includes at least one shutter blade having a first end and a second end where the first end is adapted to be pivotably joined to the cam ring and the second end is adapted to block the aperture.