Rear converter lens and imaging apparatus

A rear converter lens that is mounted on an image side of a master lens and has a negative focal length such that a focal length of a whole system thereof is longer than a focal length of the master lens alone, the rear converter lens consisting of, in order from the object side, the following four lens groups:

• a first lens group that has a positive refractive power;
• a second lens group that has a negative refractive power;
• a third lens group that has a negative refractive power;
• and
• a fourth lens group that has a positive refractive power,
• wherein the first lens group consists of, in order from the object side, a first lens group first lens which is a negative lens concave toward the image side, and a first lens group second lens which is a positive lens convex toward the object side,
• wherein the second lens group consists of, in order from the object side, a second lens group first lens which is a negative lens concave toward the image side, and a second lens group second lens which is a positive lens convex toward the object side,
• wherein the third lens group consists of, in order from the object side, a third lens group first lens which is a negative lens concave toward the object side, a third lens group second lens which is a positive lens convex toward the image side, and a third lens group third lens which is a negative lens concave toward the object side,
• wherein the fourth lens group consists of, in order from the object side, a fourth lens group first lens which is a biconvex lens, and a fourth lens group second lens which is a negative lens concave toward the object side, and
• wherein the following conditional expression (1) is satisfied,
• 0.22<cf/f12<1 (1),
• where cf is a focal length of the entire rear converter lens, and
• f12 is a composite focal length of the first lens group and the second lens group.