| 摘要 |
Provided is a zoom lens including a first lens group, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens group having a positive refractive power, wherein conditional expressions f12/fw>2.0, f2/fw<−2.0, −2.0≦̸f12/f2≦̸−0.5, and &ngr;d21−&ngr;d22>20 are satisfied, where f12 is a focal length of a single lens having a positive refractive power in the first lens group, f2 is a focal length of the second lens group, fw is a focal length of the total lens system at a wide angle end, &ngr;d21 is an Abbe number of the lens having a negative refractive power in the second lens group for the d-line, and &ngr;d22 is an Abbe number of the lens having a positive refractive power in the second lens group for the d-line. |
