| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a small optical system of smaller number of constituent elements, which has high performance and less coma aberration, especially sagittal coma aberration, and spherical aberration, an imaging device having this optical system, and a manufacturing method of the optical system. <P>SOLUTION: The optical system OS mounted in a single lens reflex camera 1 or the like COMPRISES: a first lens group Ga having a positive refractive power; a second lens group Gb having a negative refractive power; a third lens group Gc; and a fourth lens group Gd having a positive refractive power. The first lens group Ga has at least one positive lens component La, the second lens group Gb has a cemented negative lens Lbn formed by cementing a positive lens Lbnp and a negative lens Lbnn and having a convex surface toward the object side, the third lens group Gc has a cemented lens Lc formed by cementing a negative lens Lcn having a concave surface toward the object side and a positive lens Lcp, and the fourth lens group Gd has a cemented positive lens Ldp1 formed by cementing a positive lens Ldpp having a convex surface toward the object side and a negative lens Ldpn having a concave surface toward the image side, and a positive lens component Ldp2. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
