Patent ID: 7286303
Filing Date: 2007-10-23
Classification: G02B

Abstract:
1. A macro lens comprised of first to fifth lenses in the order closer to the object, the first lens being a negative meniscus lens with a concave surface oriented to the object, the fourth lens being a negative meniscus lens with a concave surface having an absolute value of the radius of curvature greater than 16.6 oriented to the image plane, and the fifth lens being a negative lens with a concave surface having an absolute value of the radius of curvature greater than 14.6 oriented to the object; the macro lens satisfying conditions as expressed in the following formulae: where F is a focal length of the entire lens system, F1 is a focal length of the first lens, F4 is a focal length of the fourth lens, and F5 is a focal length of the fifth lens.