Wide-angle lens system

A wide-angle lens system comprising a negative first lens group and a positive second lens group, in this order from an object, said first lens group comprising a positive lens element and at least one negative lens element, in this order from the object;

• wherein, in a focusing operation from infinity toward the object at a closer distance, a first focusing lens group Fa and a second focusing lens group Fb are configured to independently move from an image side toward an object side, to reduce a distance between the first focusing lens group Fa and the second focusing lens group Fb, the first focusing lens group Fa comprising said first lens group and a first sub-lens group 2F of the second lens group, which are configured to be integrally moved, and the second focusing lens group Fb comprising a second sub-lens group 2R of the second lens group;
• and
• wherein the wide-angle lens system satisfies the following conditions:
• 0<(φ1-2+φ2-1)/φ<0.3
• 0.5<HF/HL<0.9
• wherein
• φ1-2=(1−n1)/r1-2;
• φ2-1=(n2−1)/r2-1;
• φ=1/f;
• n1 designates a refractive index of said positive lens element of said first lens group;
• n2 designates a refractive index of a most object-side negative lens element of said first lens group;
• r1-2 designates a radius of curvature of an image-side surface of said positive lens element of said first lens group;
• r2-1 designates a radius of curvature of an object-side surface of the most object-side negative lens element of said first lens group;
• f designates a focal length of the wide-angle lens system;
• HF designates a radius of a bundle of axial light rays with respect to a most object-side surface of said first lens group;
• and
• HL designates a radius of a bundle of axial light rays with respect to a most object-side surface of said second lens group.