Patent ID: 6545819
Filing Date: 2003-04-08
Classification: G02B

Abstract:
A zoom lens, comprising, in order from an object side to an image side:a first lens unit of negative optical power, said first lens unit including a negative meniscus lens having a concave surface facing the image side and a positive meniscus lens having a convex surface facing the object side; a second lens unit of positive optical power, said second lens unit including a negative lens of bi-concave form, a positive lens disposed on the object side of the negative lens of bi-concave form and having a convex surface facing the object side, and a cemented lens of positive optical power as a whole disposed on the image side of the negative lens of bi-concave form; and a third lens unit of positive optical power, wherein a separation between said first lens unit and said second lens unit and a separation between said second lens unit and said third lens unit are varied to effect variation of magnification.