| 摘要 |
A first lens group (G1) having a positive refractive power, a second lens group (G2) having a negative refractive power, a third lens group (G3) having a positive refractive power, and a fourth lens group (G4) having a negative refractive power are arranged in order from the object side, the distances between the lens groups (G1 to G4) vary during zooming, and either the third lens group (G3) or the fourth lens group (G4) has at least one diffractive optic (PF). |
