| 摘要 |
PURPOSE: A small zoom lens is provided to implement high optical performance and a compact structure by using a small number of lenses. CONSTITUTION: A first lens group(G1) has a negative refractive index. A second lens group(G2) has a positive refractive index. A third lens group(G3) has a negative refractive index. A fourth lens group(G4) has a positive refractive index. A distance between the first lens group and the second lens group is decreased, a distance between the second lens group and the third lens group is increased, and a distance between the third lens group and the fourth lens group is decreased when a wide angle terminal is magnified into a telephoto terminal. |
