Patent ID: 8982477
Filing Date: 2015-03-17
Classification: G02B,G03B

Abstract:
1. A zoom lens comprising, in order from an object side: a first lens group having positive refractive power; a second lens group having negative refractive power; and a third lens group having positive refractive power, each distance between respective lens groups varying upon zooming; the third lens group including, in order from the object side, a first sub-group having positive refractive power, a second sub-group having positive refractive power, a third sub-group having negative refractive power, and a fourth sub-group having positive refractive power, the first sub-group being movable along the optical axis, thereby carrying out focusing, the third sub-group being movable in a direction including a component perpendicular to the optical axis, thereby correcting an image blur, and the following conditional expressions being satisfied: where Ft denotes a focal length of the whole of the zoom lens in a telephoto end state upon focusing on an infinitely distant object, Fw denotes a focal length of the whole of the zoom lens in a wide-angle end state upon focusing on an infinitely distant object, F