Patent ID: 7463424

Claim:
A wide converter lens attached to an object side of a main lens system, comprising: a first lens element having negative refractive power, the first lens element being disposed on the most object side and whose object-side surface is concave; and a second lens element having positive refractive power and a third lens element having negative refractive power, the second and third lens elements being disposed at an image side of the first lens element, wherein the following conditions are satisfied: 1.0<( r 1− r 2)/( r 1 +r 2)<2.0 −40 <f 1 /D<− 7, wherein (r 1 ) and (r 2 ) respectively represent curvature radii of the object-side surface and an image-side surface of the first lens element, (f 1 ) represents a focal length of the first lens element, and (D) represents a spatial distance between the second lens element and the third lens element.