| 摘要 |
Composing a projection zoom lens with a first lens group disposed on the most magnification side and having a positive power, the lens group being fixed at the time of zooming, a final lens group disposed on the most reduction side and having a negative power, the lens group being fixed at the time of zooming, and a plurality of lens groups disposed between the first and final lens groups and moved at the time of zooming along an optical axis in association with each other for the zooming and correction of image plane shift arising from the zooming, in which the final lens group includes a lens having a positive power on the most reduction side. |
