Optical system

Système optique

Optisches System

Abstract

An optical system (OL) of a telephoto type is disclosed, in which a refractive optical element made (GIT) of a solid material that satisfies νd<30, gd<-3.333×10 -3 ·νd+1.40 and gF<-2.615×10 -3 ·νd+0.67 is installed, νd representing the Abbe's number, and gd and gF representing partial dispersion ratios. A refractive power with adequate sign is given to the refractive optical element in accordance with its location. Thereby, an optical system, which can excellently correct various aberrations such as chromatic aberration, and can be manufactured easily, and has an excellent environment resistance, is realized.

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NO-Patent Citations (0)

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Cited By (2)

    Publication numberPublication dateAssigneeTitle
    EP-1659422-A1May 24, 2006Canon Kabushiki KaishaOptical system
    US-7193789-B2March 20, 2007Canon Kabushiki KaishaOptical system