| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a compact optical system having an excellent optical performance, an optical device, and a method for manufacturing the optical system.SOLUTION: An optical system includes, in order from an object side: a first lens group G1 having positive refractive power; a second lens group G2 having negative refractive power; and a third lens group G3 having positive refractive power. The optical system moves the second lens group G2 along an optical axis to shift focus from an infinite object to a short distance object, and satisfies a predetermined conditional expression.</p> |
