Patent ID: 8169714
Filing Date: 2012-05-01
Classification: G02B

Abstract:
1. A two-unit zoom lens system which forms an image on an image pickup surface, comprising in order from an object side to an image side: a first lens unit having a negative refracting power; and a second lens unit having a positive refracting power, wherein at the time of zooming from a wide angle end to a telephoto end, a distance between the first lens unit and a second lens unit is narrowed, and the first lens unit comprises in order from the object side to the image side, a first lens element having a negative refracting power, a second lens element having a negative refracting power, and a third lens element having a positive refracting power, and the total number of lens elements in the first lens unit is three, and the two-unit zoom lens system satisfies the following conditional expressions (1) and (2-2) where, f f IH denotes the maximum image height in an effective image pickup area on the image pickup surface.