| 摘要 |
PURPOSE:To perform wide variable power equal to or above the allowable range of a zoom lens by moving a mirror group on an image side in a variable power device using the zoom lens. CONSTITUTION:In the case of the variable power within the zooming allowable range of the zoom lens 5, the variable power is executed by moving the zoom lens 5 and performing zooming. In the case of the variable power out of the zooming allowable range of the zoom lens 5, the variable power is executed by moving the zoom lens 5 and correcting conjugate length by the mirror groups 6, 7 on the image side and/or mirror groups 3, 4 on an object side. |
