VARIABLE POWER OPTICAL SYSTEM, OPTICAL DEVICE, AND PRODUCTION METHOD FOR VARIABLE POWER OPTICAL SYSTEM

WIPO Patent Application WO/2018/066649

A1

A variable power optical system (ZL) has a first negative lens group (G2) having negative refractive power and a second negative lens group (G4) disposed closer to an image than the first negative lens group (G2) is, wherein, when the magnification is changed, the distance between the first negative lens group (G2) and the second negative lens group (G4) is changed, and the first negative lens group (G2) is moveable such that at least a part thereof has a displacement component in a direction perpendicular to the optical axis, the second negative lens group (G4) is configured such that at least a part thereof is moveable along the optical axis during focusing, and the conditional expression 0.50