| 摘要 |
<p>A zoom lens includes: a first negative lens group (G1); a second positive lens group (G2), including a cemented compound lens (L21) and a positive lens component (L22) ; and a third positive lens group (G3). The second lens group satisfies conditions expressed by: 0.02 < D s / ( R 22 a - R 21 b ) < 0.1 0.6 < D a / R 21 b < 0.8 where D s is the length of the air space between the cemented compound lens (L21) and the positive lens component (L22), R22 a is the radius of curvature of the object side surface of the positive lens component (L22), R21 b is the radius of curvature of the image side surface of the cemented compound lens (L21), and D a is the distance between the aperture stop and the image side surface of the cemented compound lens (L21), said aperture stop being disposed between the first and the second lens groups.</p> |
