| 摘要 |
This variable magnification optical system has a first lens group (G1) that is disposed furthest to an object side and has a positive refractive power, a negative lens group (G2) that is disposed further to an image side than the first lens group and has a negative refractive power, and a focusing group (G3) that is disposed between the negative lens group and an aperture stop, wherein: when magnification is varied, the space between the first lens group and the negative lens group changes, and the space between the negative lens group and the stop changes; during focusing, the space between the focusing group and a lens that is disposed in a position facing the object side of the focusing group changes, and the space between the focusing group and a lens that is disposed in a position facing the image side of the focusing group changes; and the focusing group comprises one single lens having a positive refractive power and satisfies a prescribed conditional expression. |
