| 摘要 |
PROBLEM TO BE SOLVED: To provide: an optical system having a compact size, high performance, and a large diameter that are suitable for a compact imaging system; and an imaging apparatus.SOLUTION: An optical system includes, in order from an object side: a first lens group G1; a second lens group G2 having positive refractive power; and a third lens group G3 having positive refractive power. The first lens group G1 and the third lens group G3 are fixed in an optical axis direction, and by moving the second lens group G2 in the optical axis direction, focusing is performed from an infinite distance object to a finite distance object. The second lens group G2 includes at least one lens having positive refractive power. The optical system satisfies predetermined conditions.SELECTED DRAWING: Figure 1 |
