Standard photographic lens system

A standard photographic lens system having wide field angle and comprising a first, second, third, fourth and fifth lens components, said first lens component being a positive meniscus lens arranged convex toward the object side, said second lens component being a negative meniscus lens arranged convex toward the object side, said third lens component being a positive meniscus lens arranged convex toward the object side, said fourth lens component consisting of a negative lens and positive lens, said fifth lens component being a biconvex lens, said standard photographic lens system satisfying the following conditions:

• 1.55f<L<1.7f (1)
• 0.88f<f.sub.B <0.93f (2)
• -1.4f<f.sub.2 <-0.8f (3)
• -3.2f<f.sub.23 <-0.8f (4)
• 0.45f<r.sub.3 <0.52f (5)
• 0.26f<r.sub.6 <0.37f (6)
• -0.35f<r.sub.7 <-0.3f (7)
• 1.65<n.sub.6 <1.8 (8)
• wherein reference symbol L represents the distance from the first surface of the lens system to the image surface, reference symbol f represents the focal length of the lens system as a whole, reference symbol f.sub.B represents the back focal length, reference symbol f.sub.2 represents the focal length of the second lens component, reference symbol f.sub.23 represents the total focal length of the second and third lens components, reference symbols r.sub.3, r.sub.6 and r.sub.7 respectively represent radii of curvature of the surface on the object side of the second lens component, surface on the image side of the third lens component and surface on the object side of the fourth lens component, and reference symbol n.sub.6 represents the refractive index of the fifth lens component.