Patent ID: 6493157
Filing Date: 2002-12-10
Classification: G02B

Abstract:
An image-capturing lens comprising, in order from the object side:a front lens group having negative refractive power; and a rear lens group having positive refractive power and formed of the following lens elements, in sequential order from the most object side of the rear lens group, a cemented lens formed of a first lens element that is biconvex and cemented to a second lens element that is biconcave, a third lens element that is biconvex; and a fourth lens element that is biconvex; said rear lens group satisfying the following condition |&bgr;5+&bgr;6|&lE;0.3 â€ƒwhere &bgr;5 is defined as equal to the product of (1âˆ’b5) (b6) (b7) (b8), and &bgr;6 is defined as the product of (1âˆ’b6) (b7) (b8), â€ƒwith b5 being the transverse magnification of the first lens element in the rear lens group, b6 being the transverse magnification of the second lens element in the rear lens group, b7 being the transverse magnification of the third lens element in the rear lens group, and b8 being the transverse magnification of the fourth lens element in the rear lens group.