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The present invention relates to a lens system, an optical apparatus and an image sensing device. In particular, the present invention relates to a lens system and an optical apparatus which are suitably used for an optical apparatus such as a video camera and an image sensing device such as a digital still camera with an image pick-up device using a solid image sensing device such as a CCD.
2. Description of the Related Art
Various types of lens systems used for digital still cameras, video cameras and the like, have been proposed in various forms. Further, various technologies of high-accuracy lens systems, wide angle lens systems and the like have been proposed.
In recent years, with the progress of the miniaturization of the solid image sensing device used for digital still cameras, video cameras and the like, a large image area of the solid image sensing device has been realized. Further, miniaturization of the solid image sensing device for digital still cameras has been realized. To cope with this, there has been proposed a method of realizing a larger aperture by adjusting the ratio of the focal length of each of a positive lens element and a negative lens element constituting a lens system.
Japanese Patent Laid-Open No. 10-182641 has proposed, as a lens system with a large aperture ratio, a three-lens-group lens system having a large aperture ratio of F/2.4 and a high resolution by satisfying Equation 1 as a condition.l=−0.92−0.70(−1.10) Equation 1where l is the focal length of the lens group having the positive refractive power and n is the refractive power of the lens group having the negative refractive power.
Further, Japanese Patent Laid-Open No. 7-241569 has proposed, as a lens system which is small in size and has a large aperture ratio, a three-lens-group lens system having a small total refractive power. This is made possible by suitably distributing refractive powers of the lens group.