| 摘要 |
PURPOSE: A zoom lens and photographing device are provided to easily correct an axial chromatic aberration and a diameter chromatic aberration on a telephoto shift because an Abbe number of one or more positive lenses between two positive lenses comprised in a first lens unit is set over 80. CONSTITUTION: A zoom lens comprises a first lens group(G1), a second lens group(G2), a third lens group(G3), a fourth lens group(G4), and a iris(SP). The first lens unit has a positive refractive power. The second lens group is arrange in the rear part of the first lens group and zooms by moving in a optical axis direction with a sub refractive power. The third lens group comprises a cemented lens which one or more sides where the positive lens and minus lens are connected are aspheric. The fourth lens group is arranged in the rear par of the third lens group. The iris is arranged between the second lens group and third lens group. |
