| 摘要 |
The invention relates to a photographic lens having a first lens member in the form of a positive meniscus lens convex on the object side, a second lens member in the form of a biconcave lens, a third lens member in the form of a biconvex lens and a fourth lens member in the form of a negative meniscus lens concave on the object side. By using a glass material or a plastic having a refractive index below 1.65 for the fourth lens member, the lens fulfils the following conditions: 1) 1.45 < n4 < 1.65 2) 1.55 < n1 < 1.75 3) 1.65 < n2 < 1.86 4) 30 < nu 3 < 50 In the above, n1, n2, n4 denote the refractive index of the first, second and fourth lens members respectively, and nu 3 denotes the Abbe number of the third lens member. <IMAGE>
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