Patent ID: 7551367

Claim:
A wide-angle lens comprising, in order from an object: a first lens group having negative refractive power; a second lens group having positive refractive power; and a third lens group having positive refractive power; the first lens group including a positive lens; upon focusing from an infinity object to a close object, the first lens group being fixed, and the second lens group and the third lens group being moved to the object, and the following conditional expressions being satisfied: 1.10 <−f 1 /f 2<1.50 1.80<n1p where f 1 denotes a focal length of the first lens group, f 2 denotes a focal length of the second lens group, and n 1 p denotes a refractive index of the positive lens in the first lens group at d-line in which wavelength λ=587.6 nm.