| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical system capable of obtaining a zoom lens excellent in image forming performance with a small number of lenses and realizing the manufacture of a thin and high-performance digital camera or a video camera, and to provide an imaging apparatus using the same. SOLUTION: In the optical system equipped with the cemented lens having a bonded surface on an optical axis, air contact surfaces being a light beam incident side and a light beam emitting side in the cemented lens G2 are aspherical, and at least one bonded surface of the cemented lens G2 satisfies a following condition. (1) 6.4<¾(r/R)¾, provided that r is the radius of curvature on the optical axis of the connecting surface and R is the maximum diameter of the connecting surface. COPYRIGHT: (C)2006,JPO&NCIPI
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