Rear conversion lens system

A rear conversion lens system comprising a front lens group and a rear lens group in the order from the object side and said front lens groups comprising a first lens component arranged as a biconvex lens, a second lens component arranged as a negative lens having a surface with a small radius of curvature on the image side, and a third lens component arranged as a positive meniscus lens convex toward the object side, and said rear lens group comprising a fourth lens component arranged as a biconcave lens, and a fifth lens component arranged as a positive lens component formed that the foremost surface thereof is convex toward the object side and the rearmost surface thereof is convex toward the image side, said rear conversion lens system having a magnification higher than 1.6 and fulfilling the conditions (1) and (2) shown below:

• ##EQU4## where, reference symbols r.sub.1 and r.sub.2 respectively represent radii of curvature of the surfaces on the object side and on the image side of the first lens component, reference symbol r.sub.3 represents the radius of curvature of the surface on the object side of the second lens component, and reference symbol r.sub.6 represents the radius of curvature of the surface on the image side of the third lens component.