| 摘要 |
<p>Compact zoom lens are provided to perform a magnification operation by moving the location of each lens group from the process. A first optic group(G1) is installed at the location which it is most near from the object side(O). The first optic group has the definition refractive power. The second lens group(G2) is installed at the next location of the first optic group. The second lens group has the refractive power of the part. The third lens group(G3) is installed at the next location of the second lens group. The third lens group has the definition refractive power. The fourth lens group(G4) is installed at the next location of the third lens group. The fourth lens group has the definition refractive power. In the wide angle edge, the magnification process to the telephoto shift is performed by moving the location of each lens group. In the magnification process, interval between the second lens group and the first optic group are increased. In the magnification process, interval between the third lens group and the second lens group drop. In the magnification process, interval between the fourth lens group and the third lens group are increased. In the fourth lens group is the magnification process, the upper side movement and focal point correction are achieved.</p> |
