VARIABLE-MAGNIFICATION OPTICAL SYSTEM, OPTICAL DEVICE HAVING SAME VARIABLE-MAGNIFICATION OPTICAL SYSTEM, AND METHOD FOR MANUFACTURING VARIABLE-MAGNIFICATION OPTICAL SYSTEM

摘要

A variable magnification optical system includes, in order from the object side, a first lens group G1 having negative refractive power; a second lens group G2 having positive refractive power; a third lens group G3 having negative refractive power; and a fourth lens group G4 having positive refractive power; upon zooming from a wide-angle end state to a telephoto end state, a distance between the first lens group G1 and the second lens group G2 being varied, a distance between the second lens group G2 and the third lens group G3 being varied, and a distance between the third lens group G3 and the fourth lens group G4 being varied; at least one single lens of the second lens group G2 being a vibration reduction lens group VL which is moved so as to have a component in a direction perpendicular to the optical axis; and predetermined conditional expression being satisfied, thereby providing the variable magnification optical system capable of attaining superb optical performance with making variation of various aberrations small and coping with variation of various aberrations upon correcting a camera shake, an optical apparatus equipped with the variable magnification optical system, and a method for manufacturing the variable magnification optical system.