A method of moving at least one optical element of a plurality of optical elements of an image-forming lens system, wherein the plurality of optical elements are positioned along a common optical axis such that the lens system is in a ready-to-image position, the lens system having an object side and an image side. The method includes positioning the lens system such that no image may be taken, including moving the at least one optical element to a position away from the common optical axis and toward the image side, and moving at least one other optical element of the plurality of optical elements along the common optical axis toward the image side.