Patent ID: 8149516
Filing Date: 2012-04-03
Classification: G02B

Abstract:
1. A zoom lens comprising: in order from an object side to an image side, a first lens unit which has a positive refractive power and does not move for a zoom operation, a second lens unit which has a negative refractive power and moves in the zoom operation, a third lens unit which moves in the zoom operation, and a fourth lens unit which has a positive refractive power and does not move for the zoom operation, wherein the fourth lens unit is constituted by a forty-first lens unit which has a negative refractive power and is arranged at the object side with reference to the longest air gap and a forty-second lens unit which has a positive refractive power and is arranged at the image side with reference to the air gap, the forty-first lens unit includes a negative 411st lens, the forty-second lens unit includes a positive 421st lens, and the following conditional expressions are satisfied, where νd