| 摘要 |
<p>Provided is an objective optical system in which aberration correction is satisfactory, and which is, although having a small size and a wide viewing angle, suitably compatible with a high-definition, high-pixel-count solid-state imaging device. Provided is an objective optical system (1) including, in order from the object side, an aperture stop (S), a positive first group (G1), a second group (G2), and a third group (G3), wherein an image-side surface of the first group (G1) is convex toward the image side, and the second group (G2) is formed of two positive lenses or a single lens (L3).</p> |
