Patent ID: 8159757
Filing Date: 2012-04-17
Classification: G02B

Abstract:
1. A zoom lens comprising, sequentially from an object side: a positive first lens group; a negative second lens group; a positive third lens group; and a positive fourth lens group, wherein 2.0≦D23W/FW≦3.0 is satisfied, D23W being an interval, at a wide angle edge, between a lens that among lenses of the second lens group, is farthest on an imaging plane side and a lens that among lenses of the third lens group, is farthest on the object side, FW being a focal length of an optical system of the zoom lens at infinity focus, at the wide angle edge, and wherein 15≦(TaW+TaT)/(tan(ωW)×Ymax)≦33 is satisfied, TaW being a total length of the optical system, at the wide angle, from a surface farthest on the object side to an imaging plane edge, TaT being a total length of the optical system, at a telephoto edge, from the surface farthest on the object side to an imaging plane, ωW being a half angle of view of the optical system, at the wide angle edge, and Ymax being a maximum paraxial image height at the wide angle edge.