| 摘要 |
At least one exemplary embodiment is directed to a zoom optical system which includes a plurality of optical groups with variable optical power arranged along an optical axis; and at least one optical group arranged along the optical axis, and where the system is zoomed by changing the power of at least one of the plurality of the optical groups with variable optical power, where the plurality of the optical groups with variable optical power each includes a rotationally asymmetric surface and each has a plurality of optical devices, which change the power within the respective optical groups by moving the respective optical devices in a direction different from the optical axis, and the system at a telephoto end satisfies the condition: |phidt|<=|phist|, where |phidt| is the absolute value of the power total sum of a plurality of the optical groups with variable optical power, and |phist| is the absolute value of the power total sum of the at least one optical group.
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