To provide a variable power optical system in which deterioration of optical performance during vibration reduction is suppressed, and excellent optical performance is achieved from the wide angle state to the telephoto state.
The variable power optical system comprises, in order from the object side: a positive first lens group G1; a negative second lens group G2; a positive third lens group G3; and a positive fourth lens group G4. When varying power from the wide angle state to the telephoto state, the position of the first lens group G1 in the optical axis direction is fixed, and at least the second lens group G2 and the third lens group G3 are moved in the optical axis direction so that the distance between the first lens group G1 and the second lens group G2 is increased, and the distance between the second lens group G2 and the third lens group G3 is decreased. The fourth lens group G4 includes, in order from the object side, a positive first partial lens group G4A, a negative second partial lens group G4B, and a positive third partial lens group G4C. At least a part of the second partial lens group G4B is moved so as to include a component in a direction perpendicular to the optical axis. The variable power optical system satisfies predetermined conditional expressions.
| JP2012118097A | 2012-06-21 | |||
| JP2011197302A | 2011-10-06 | |||
| JP2009156893A | 2009-07-16 |
| US20110228407A1 | 2011-09-22 | |||
| US20090086321A1 | 2009-04-02 | |||
| US20090161228A1 | 2009-06-25 |
Kenichi Aihara
Ryuji Ito
Junko Inoue