Patent ID: 8995064
Filing Date: 2015-03-31
Classification: G02B

Abstract:
1. A zoom lens comprising, in order from an object: a first lens group having positive refractive power; a second lens group having negative refractive power; a third lens group having positive refractive power; and a fourth lens group having positive refractive power, upon zooming from a wide-angle end state to a telephoto end state, the first lens group being moved, a distance between the first lens group and the second lens group being changed, a distance between the second lens group and the third lens group being changed and the fourth lens group being moved toward the object first, then moved toward an image, the third lens group including, in order from the object, a first positive lens, a negative lens and a second positive lens, the fourth lens group including two lens components, and the following conditional expressions being satisfied: where f fw denotes a focal length of the zoom lens in the wide-angle end state, and f