Patent ID: 6967782
Filing Date: 2005-11-22
Classification: G02B

Abstract:
1. A zoom lens system comprising, in order from an object side of said zoom lens system, a first lens group having negative refracting power, a second lens group having positive refractive power, a third lens group having negative refracting power, a fourth lens group having positive refracting power and a fifth lens group having positive refracting power, wherein during zooming from a wide-angle end to a telephoto end of said zoom lens system, a space between said first lens group and said second lens group, a space between said third lens group and said fourth lens group, and a space between said third lens group and said fifth lens group becomes narrow while a space between said second lens group and said third lens group, a space between said fourth lens group and an image-formation plane, and a space between said fifth lens group and said image-formation plane becomes wide, and focusing on a subject is carried out by movement of said fifth lens group.