| 主权项 |
1. An optical instrument having a first lens group and a second lens group capable of moving in an optical axis direction in order to perform optical zooming, comprising:
a first drive section for moving the first lens group; a second drive section for moving the second lens group; a storage section for storing first position information relating to positions of the first lens group and positions of the second lens group corresponding to identical focal lengths that fall within a focal length region range in which zoom operations of the optical instrument are carried out, and second position information relating to positions of the first lens group and positions of the second lens group corresponding to different focal lengths that fall within the focal length region with a second optical state of a higher shooting magnification than a first optical state being established when establishing substantially the same focal length as a focal length of the first optical state based on the first position information; a control section for controlling the first drive section and the second drive section so that, when setting up an optical state of a higher shooting magnification from an optical state where positions of the first lens group and the second lens group have been positioned at positions corresponding to the same focal length that falls within a focal length region range in which zoom operations are carried out, based on the first position information, the first lens group and the second lens group are respectively moved to positions corresponding to a focal length that is mutually different to that of the first position information for within the focal length region range in which zoom operation is carried out, based on the second position information, so as to set up the second optical state; and a focus adjustment lens group which is different from the first lens group and the second lens group, wherein the control section, when the second optical state of higher shooting magnification is set up based on the second position information, from an optical state based on the first position information, controls the focus adjustment lens group to a position corresponding to a range of distance in which focus can be adjusted, in the second optical state having higher shooting magnification. |
