Wide angle photographic lens

Claim 1

A wide angle lens consisting of six lenses wherein the following conditions are satisfied: (1) ν.sub.1, ν.sub.2 > 50 (2) F/1.3 < |F.sub.1.2 |< F/0.75, F.sub.1.2 < 0 (3) 0.1 < |r.sub.5 /r.sub.6 | < 1.5 wherein the characters designate dimensions as follows: F: composite focal length F 1 .2 : composite focal length of the lens system consisting of the first and second lenses ν i : Abbe's number of the i-th lens r j : the radius of curvature of the j-th surface, wherein the first lens is a positive meniscus lens convex to the object, the second lens is a positive meniscus lens convex to the object, the third lens is a thick double convex lens, the fourth lens is a double concave lens, the fitth lens is a positive meniscus lens convex to the image, and the sixth lens is a positive meniscus lens convex to the image, and wherein the radii r 1 to r 12 , the thicknesses and separations d 1 to d 11 , the refractive indices N 1 to N 6 , and Abbe numbers ν 1 to ν 6 of said first to sixth lenses L 1 to L 6 , respectively, satisfy the following conditions: F = 100 back focal length =130.662 F 1 .2 = -106.952 Radius of Lens Thickness Refractive Abbe Lens Curvature r or Distance d Index N No. ν ______________________________________ r.sub.1 = 268.630 L.sub.1 d.sub.1 = 12.54 N.sub.1 =1.62280 ν.sub.1 =57.0 r.sub.2 = 1489.437 d.sub.2 = 0.35 r.sub.3 = 179.577 L.sub.2 d.sub.3 = 19.23 N.sub.2 =1.62041 ν.sub.2 =60.3 r.sub.4 = 38.908 d.sub.4 = 45.42 r.sub.5 = 94.880 L.sub.3 d.sub.5 = 44.26 N.sub.3 =1.72000 ν.sub.3 =43.7 r.sub.6 = -85.317 d.sub.6 = 10.56 r.sub.7 = -62.000 L.sub.4 d.sub.7 = 4.23 N.sub.4 =1.74077 ν.sub.4 =27.8 r.sub.8 = 137.345 d.sub.8 = 4.86 r.sub.9 = -237.782 L.sub.5 d.sub.9 = 8.06 N.sub. 5 =1.62041 ν.sub.5 =57.0 r.sub.10 = -64.877 d.sub.10 = 0.35 r.sub.11 = -1802.817 L.sub.6 d.sub.11 = 8.52 N.sub.6 =1.62041 ν.sub.6 =60.3 r.sub.12 = -81.169 . ______________________________________