| 摘要 |
An imaging optical system, includes: in the order from an object side to an image plane side, a first lens group (G1) having a first lens (L1) which is formed as a negative lens; a second lens group (G2) having a second lens (L2) which is formed as a plano-concave lens, a third lens (L3) which is formed as a negative meniscus lens, and a fourth lens (L4) which is formed as a biconvex lens; an aperture stop (S); a third lens group (G3) having a fifth lens (L5) which is formed as a biconvex lens, and a sixth lens (L6) which is formed as a biconcave lens; and a fourth lens group (G6) having a seventh lens (L7) which is formed as a negative meniscus lens. |
