| 摘要 |
A projection zoom lens includes a first lens group having a negative reflecting power and a second to fifth lens groups each having a positive reflecting power are provided in the order from the magnification side. Nine lenses are distributed in a manner that the first lens group has one lens, the second lens group has one lens, the third lens group has two lenses, the fourth lens group has four lenses and the fifth lens group has one lens. Since the second lens group, the third lens group and the fourth lens group are moved at the time of the power-varying operation, various kinds of aberrations may be made despite of simple configuration. The first lens group is an aspherical lens which concave surface is directed to the reduction side.
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