Compact telephoto lens

Claim 1

A compact telephoto lens having an angle of view of 18° to 24°, an aperture ratio of 1:2.8 and a telephoto ratio of 0.92 to 0.94, and consisting essentially of, in succession from the object side, a first lens which is a single positive lens having its surface of sharper curvature facing the object side, a second lens which is a positive meniscus lens having its convex surface facing the object side, a third lens which is a single negative lens having its surface of sharper curvature facing the image side, a stop, and a fourth lens which is a single positive lens having its surface of sharper curvature facing the object side, said telephoto lens satisfying the following conditions: ______________________________________ 0.35 < f.sub.12 < 0.4f (I) 0.2f < d.sub.1 + d.sub.2 + d.sub.3 + d.sub.4 + d.sub.5 < 0.25f 0.19f < r.sub.6 < 0.21f 1.35f < f.sub.123 < 1.46f (II) 0.27f < d.sub.6 < 0.32f n.sub.1, n.sub.2 > 1.6,n.sub.3, n.sub.4 > 1.7 (III) γ.sub.1, γ.sub.2 > 50, γ.sub.3, γ.sub.4 < 30 where r 1 -r 8 represent the radii of curvature, d 1 -d 7 represent the center thickness and air spaces of the respective lenses, n 1 -n 4 represent the refractive indices of the respective lenses, γ 1 -γ 4 represent the Abbe numbers of the respective lenses, f 1-4 represent of the focal lengths of the respective lenses, f represents the total focal length of the entire system, f 123 represents the total focal length of the first to third lenses and f 12 represents the total focal length of the first and second lenses.