Fixed focal length objective lens

A fixed focal length objective lens forming an image of an object comprising:

• a plurality of lens elements;
• and
• an aperture stop defining an aperture stop proximity space and at least one field proximity space;
• wherein at least three of the lens elements each have at most one aspherical surface;
• wherein either:
• two lens elements with an aspherical surface are positioned in the aperture stop proximity space and at least one of the other lens elements with an aspherical surface is positioned in the at least one field proximity space, or
• at least one of the lens elements with an aspherical surface is positioned in the aperture stop proximity space and two lens elements with an aspherical surface are positioned in the at least one field proximity space;
• wherein a marginal ray has at every intersection point with an optical surface a distance HM to the optical axis;
• wherein a chief ray from the outmost object field point has at every intersection point with an optical surface a distance HC to the optical axis;
• and
• wherein the ratio HC/HM is larger than or equal to 2 at the position of at least one of the lens elements with an aspherical surface in the field proximity space.