| 摘要 |
Provided is a variable magnification optical system comprising: a first lens group (G1) that is arranged closest to the object side and that has a positive refractive power; a negative lens group (G2) that is arranged further toward the image side than the first lens group and that has a negative refractive power; a positive lens group (G4) that is arranged further toward the image side than the negative lens group, that includes at least one lens which moves together with an aperture stop, and that has a positive refractive power; and a focusing group (G3) that is arranged between the negative lens group and the positive lens group. When varying magnification, the interval between the first lens group and the negative lens group changes and the interval between the negative lens group and the positive lens group changes. When focusing, the interval between the focusing group and a lens arranged in a position facing the object side of the focusing group changes, the interval between the focusing group and a lens arranged in a position facing the image side of the focusing group changes, and a predetermined conditional expression is satisfied. |
