Optical system, optical device, and method for manufacturing optical system

Abstract

To provide an optical system which is compact and yet has bright and good optical performance.SOLUTION: An optical system OL is comprised of a front group GA, an intermediate group GM, and a rear group GR, the intermediate group GM comprises a first focusing lens group GF1 and a second focusing lens group GF2. When focusing, the first focusing lens group GF1 and the second focusing lens group GF2 move on trajectories different from each other, along an optical axis, while the front group GA and the rear group GR are stationary relative to an image plane I. The rear group GR has a negative lens located on the most image side in the rear group GR. The optical system satisfies the following conditional expressions: 0.09<fF2 / fA<0.40, 0.10<fA / |fF1|<3.00, where fA represents a focal length of the front group GA, fF1 represents a focal length of the first focusing lens group GF1, and fF2 represents a focal length of the second focusing lens group GF2.SELECTED DRAWING: Figure 1

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