Patent ID: 9176308
Filing Date: 2015-11-03
Classification: G02B

Abstract:
1. A zoom lens comprising sequentially from an object side: a first lens group having a positive refractive power; a second lens group having a negative refractive power; a third lens group having a positive refractive power; a fourth lens group; and at least one lens group subsequent to the fourth lens group toward an image plane, wherein zooming between a wide angle edge and a telephoto edge is performed by varying intervals between the lens groups, along a direction of an optical axis, correction of hand-shake occurring with optical system vibration is performed by shifting any one among the entire second lens group and a portion of lenses forming the second lens group, in a direction that is substantially orthogonal to the optical axis, and conditional expression (1) 0.5≦D2W×(−F2)/(Ft×tan(ωw))≦2.0 and condition expression (2) 90≦(F1×Ft)/(−F2×F3)≦200 are satisfied, where D2W is an interval between the second lens group and the third lens group at the wide angle edge, F1 is the focal length of the first lens group, F2 is the focal length of the second lens group, F3 is the focal length of the third lens group, Ft is the focal length of the optical system overall at the telephoto edge, and ωw is a half-angle at the wide angle edge.