Patent ID: 8498065

Claim:
A lens system comprising, in order from an object side: a first lens group; and a second lens group having positive refractive power; the first lens group including a sub-lens group having positive refractive power, and a sub-lens group having negative refractive power, the sub-lens group having negative refractive power including a meniscus lens having a convex surface facing the object side, the following conditional expressions being satisfied: 1.910<ndh −0.400 <f/f 1<0.500 24.0<νdh where ndh denotes a refractive index at d-line (wavelength=587.6 nm) of a lens having the highest refractive index at d-line in the lens system, f 1 denotes a focal length of the first lens group, f denotes a focal length of the lens system, and νdh denotes an Abbe number at d-line of the lens having the highest refractive index at d-line in the lens system.