| 摘要 |
This optical system satisfies a prescribed relation and comprises the following, in order along the optical axis from the object side: a negative meniscus first lens, the convex surface of which faces the object side; a negative meniscus second lens, the convex surface of which faces the object side; a third lens, a concave surface of which faces the object side; and a fourth lens that has a positive refractive power, the surface of which that faces the object side being convex. This makes it possible for said optical system to exhibit high image-forming performance. |
