Patent ID: 7369313
Filing Date: 2008-05-06
Classification: G02B

Abstract:
1. A zoom lens, comprising: a power variation section and a final lens group disposed in order from an object side; said power variation section including at least two movable lens groups which are movable in a direction of an optical axis thereof to vary a lens position state from a wide angle end state to a telephoto end state; said final lens group being fixed in the direction of the optical axis independently of the lens position state, said final lens group including three sub groups which include a first sub group having a negative refracting power, a second sub group having a positive refracting power and a third sub group having a positive refracting power, disposed in order from the object side; said second sub group being shiftable in a direction substantially perpendicular to the optical axis to shift an image; a conditional expression (1) being satisfied where ft is the focal distance of the entire lens system in the telephoto end state and fBt is the focal distance of entire lens groups disposed on the object side with respect to said third sub group in the telephoto end state.