Patent ID: 8503102
Filing Date: 2013-08-06
Classification: G02B

Abstract:
1. A zoom lens system for forming an image of an object, said system having an object side and an image side, said system having a wide position and a tele position for zooming, said system comprising in order from the object side to the image side: a first lens group with negative power and having a stationary lens element; a second lens group with positive power; a third lens group with negative power; a fourth lens group with positive power; and a fifth lens group; wherein the second, third, fourth, and fifth lens groups are movable to vary magnification of the image during zooming, the second and fourth lens groups moving toward the object side during zooming from the wide position to the tele position, and the fifth lens group moving at first toward the image side and then toward the object side during zooming from the wide position to the tele position.