| 摘要 |
PROBLEM TO BE SOLVED: To provide a zoom lens which excellently corrects various aberrations while achieving a reduction in size in the thickness direction, and an imaging device using the zoom lens.SOLUTION: The zoom lens includes at least, in order from the object side, a first lens group Gr1 having negative refractive power, and a second lens group Gr2 having positive refractive power, and varies power by changing the distance between the lens groups. When varying power from the wide angle end to the telephoto end, the distance between the first lens group Gr1 and the second lens group Gr2 is decreased. The first lens group Gr1 includes a reflection optical element PRM having a function for bending the optical path by reflecting a light beam. The second lens group Gr2 is composed of a single cemented lens L21 made up of three lenses L21a, L21b, L21c. The zoom lens satisfies the following conditional expression (1): (1) 1.59<n21<2.20, where n21 is the refractive index of the lens L21a which is the lens located closest to the object side in the second lens group Gr2. |
