| 摘要 |
<p>[Problem] To provide a compact zoom lens which is optimal for an interchangeable lens for a mirror-less camera. [Solution] A zoom lens comprising, in order from the object side, a first lens group (G1) which has negative refractive power and moves during changes in magnification, a second lens group (G2) which has positive refractive power and moves during changes in magnification, and a third lens group (G3) which has positive refractive power and is fixed during changes in magnification, wherein: the first lens group (G1) comprises, in order from the object side, a negative lens (L11) having a concave surface on the image side, a negative lens (L12) having a concave surface on the image side, and a positive lens (L13) having a convex surface on the object side; the second lens group (G2) comprises, in order from the object side, a diaphragm (St), a positive lens (L21) having a convex surface on the object side, a cemented lens comprising, in order from the object side, a positive lens (L22) having a convex surface on the object side and a negative lens (L23) having a concave surface on the image side, the cemented lens having positive refractive power as a whole, and a negative lens (L24) having a convex surface on the image side and having at least one non-spherical surface; and the third lens group comprises a positive lens (L31).</p> |
