Behind-stop type lens system for photographic cameras

A behind-stop type lens system for photographic cameras comprising a first positive meniscus lens component having a convex surface on the object side, a second biconcave lens component and a third cemented doublet component consisting of a biconvex lens element and a negative lens element, and said lens system satisfying the conditions enumerated hereunder:

• (1) 0.23f<.SIGMA.d<0.28f
• (2) 0.55<f.sub.1 <0.59f.
• (3) -0.37f<f.sub.2 <-0.32f
• (4) n.sub.1 >1.71
• (5) n.sub.2 <1.67
• (6) .vertline.r.sub.7 .vertline.>4.8f
• (7) 0.26f<-r.sub.6 <0.34f
• (8) .vertline.r.sub.3 .vertline./r.sub.4 >6.0
• (9) .nu..sub.1 -.nu..sub.2 >14
• wherein the reference symbol .SIGMA.d represents total length of said lens system as a whole, the reference symbols f.sub.1, f.sub.2 and f designate focal lengths of the first, second lens components and the lens system as a whole respectively, the reference symbols n.sub.1 and n.sub.2 denote refractive indices of the first and second lens components respectively, the reference symbols r.sub.3 and r.sub.4 represent radii of curvature on the respective surfaces of the second lens component, the reference symbols r.sub.6 and r.sub.7 designate radii of curvature on the cemented surface and image side surface respectively of the third lens component and the reference symbols .nu..sub.1 and .nu..sub.2 denote Abbe's numbers of the first and second lens components respectively.