| 摘要 |
<p>Disclosed is an image pickup lens which excellently corrects various aberrations, while being fast and compact with a wide angle of view. This image pickup lens has a negative first lens group (G1) and a positive second lens group (G2) in this order from the object side. The first lens group (G1) is composed of merely a first lens (L1), which is one negative lens. The second lens group (G2) is composed of, in the following order from the object side: a cemented lens, which is formed by bonding a positive lens, i.e., a second lens (L2), and a negative lens, i.e., a third lens (L3), in this order from the object side, and which has a positive refractive power as a whole; a diaphragm (St); a positive lens, i.e., a fourth lens (L4); and a negative lens, i.e., a fifth lens (L5). The image pickup lens is configured so as to satisfy the conditional equation of (1a): -2.3<f1/fg2<-0.45, where f1 represents a focal point distance of the first lens (L1), and fg2 represents a focal point distance of the second lens group (G2).</p> |
