OPTICAL SYSTEM, OPTICAL DEVICE, AND MANUFACTURING METHOD FOR OPTICAL SYSTEM

摘要

In the present invention, the following are provided in order from the object side: a first lens group (G1) having a positive refractive power; a second lens group (G2) having a negative refractive power; and a third lens group having a positive refractive power. Focusing from an infinite object to a near object is carried out by causing the second lens group (G2) to move along the light axis, and a prescribed conditional formula is satisfied. Due to this configuration, provided are the following: an optical system that is small and has favorable optical characteristics; an optical device; and a manufacturing method for the optical system.