An optical-lens-set includes a first lens of a convex object surface near the optical-axis, a second lens of negative refractive power of an object surface with a convex portion near the optical-axis and a convex portion near its periphery, a third lens of a convex image surface near its periphery, a fourth lens of a concave object surface near its periphery and a convex image surface near its periphery, a fifth lens of a concave object surface near its periphery and an image surface with a convex portion near the optical-axis and a convex portion near its periphery, a sixth lens of a concave image surface near the optical-axis so that an F-number, the total thickness ALT of all six lens, an air gap G34 between the third lens and the fourth lens and an air gap G45 between the fourth lens and the fifth lens satisfy F-number≤1.8 and ALT/(G34+G45)≥9.0.