| 摘要 |
PURPOSE:To obtain a compact zoom lens having a high zooming ratio, by constituting the zoom lens with positive, negative, positive, and positive lens groups arranged in order from the object side and not only moving the first, the third, and the fourth lens groups on the optical axis but also moving the first and the third lens groups as one body in case of zooming. CONSTITUTION:The zoom lens consists of four lens groups of the first positive lens group, the second negative lens group, the third positive lens group, and the fourth positive lens group arranged in order from the object side. In case of zooming, all lens groups except the second lens groups are moved on the optical axis, and the first and the third lens groups are moved as one body. |
