| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a limited zoom lens which has satisfactorily corrected aberrations within a zoom range, has aberrations less varied in accordance with zooming and has high optical performance for a range from the center to the periphery of an image, and an optical device including the limited zoom lens. <P>SOLUTION: The limited zoom lens includes, in order from the object side along an optical axis: a first lens group G1 having positive refractive power; a second lens group G2 having negative refractive power; a third lens group G3 having positive refractive power; a fourth lens group G4 having positive refractive power; and a fifth lens group G5 having positive refractive power. The limited zoom lens is configured so that, during zooming, the first lens group G1 and the fifth lens group G5 are fixed relative to an image surface position and the second lens group G2, the third lens group G3, and the fourth lens group G4 are moved along the optical axis to make paraxial rays passing between the first lens group G1 and the second lens group G2 substantially parallel. <P>COPYRIGHT: (C)2013,JPO&INPIT |
