| 摘要 |
A wide-angle projection zoom lens includes: a first negative lens group for focus adjustment that is fixed when power varies; a second positive lens group, a third negative lens group, and a fourth positive lens group that are moved when power varies; and a fifth positive lens group that is fixed when power varies. The first to fifth lens groups are arranged in this order from a magnification side. The first lens group includes a first negative lens, which is an aspheric lens made of plastic, a second negative lens, a third negative lens, and a fourth positive lens which are arranged in this order from the magnification side. The wide-angle projection zoom lens is configured so as to satisfy four predetermined conditional expressions. |
