Patent ID: 6618210
Filing Date: 2003-09-09
Classification: G02B,H04N

Abstract:
A zoom lens system comprising in order from the object side; a first lens unit having negative refractive power; a second lens unit having positive refractive power; and a third lens unit having positive refractive power, wherein a magnification is changed from a wide-angle position to a telephoto position by moving the second lens unit along an optical axis on the object side and moving the third lens unit along the optical axis, wherein said second lens unit consists of four lens elements including, in order from the object side, two positive lens elements and a negative lens element and satisfies the following conditions (1) and (2):1.30.25f2/f3|<1.5 â€ƒâ€ƒ(2) wherein a reference symbol &bgr;23T represents a total magnification of the second lens unit and the third lens unit at the telephoto position, and reference symbols f2 and f3 designate focal lengths of the second lens unit and the third lens unit respectively.