Patent ID: 8743468

Claim:
A wide converter lens that is disposed on an object side of a main lens and changes the viewing angle, the wide converter lens comprising: a first lens having a negative refractive power, a second lens having a negative refractive power, and a third lens having a positive refractive power, wherein the first lens, the second lens, and the third lens are sequentially ordered from the object side to the image side, and the wide converter lens satisfies the following inequality: 2vd≧50 where 2vd is an Abbe number of the second lens; wherein the wide converter lens satisfies the following inequality: 0 <D/ 1 stY≦ 1 where D is the total thickness of the wide converter lens along an optical axis, and 1 stY is an effective radius of the first lens; and wherein the wide converter lens satisfies the following inequality: 0.7 ≦WEFL/EFL≦ 0.8 where EFL is the focal length of the main lens, and WEFL is the combined focal length of the main lens and the wide converter lens.