VARIABLE MAGNIFICATION OPTICAL SYSTEM, OPTICAL DEVICE AND IMAGING DEVICE USING SAID VARIABLE MAGNIFICATION OPTICAL SYSTEM, AND MANUFACTURING METHOD OF SAID VARIABLE MAGNIFICATION OPTICAL SYSTEM

摘要

This variable magnification optical system ZL comprises, arranged in order from the object side, a first lens group (G1) having positive refractive power, a second lens group (G2) having negative refractive power, a third lens group (G3) having positive refractive power, and a subsequent lens group (GR). When changing magnification, the interval between the first lens group (G1) and the second lens group (G2) changes, the interval between the second lens group (G2) and the third lens group (G3) changes, and the interval between the third lens group (G3) and the subsequent lens group (GR) changes, and the subsequent lens group (GR) has a focusing lens group that moves during focusing, and satisfies the following conditional expressions:0.18 (-fF)/f1 0.300.84 (-f2)/f3 1.20,whereinfF: the focal length of focusing lens subgroupf1: the focal length of the first lens group (G1)f2: the focal length of the second lens group (G2)f3: the focal length of the third lens group (G3)