Lens assembly for optical imaging

An optical imaging lens assembly comprising, in order from an object-side to an image side:

• a first aspherical positive lens element comprising an object-side surface and an image-side surface;
• and
• a second aspherical negative lens element comprising an object-side surface and an image-side surface;
• wherein elements of the optical imaging lens assembly are configured to satisfy the relations:
• T<1.2f;
• 1.1<f/f1<1.5;
• −1.5<f/f2<−0.6;
• 0.2<R1/f<0.5;
• and
• −0.25<K1<−0.05;
• and wherein f is focal length of the optical imaging lens assembly, f1 is focal length of the first lens element, f2 is focal length of the second lens element, R1 is radius of curvature on the object-side surface of the first lens element, K1 is conic of the object-side surface of the first lens element, T1 is thickness of the first lens element, T2 is distance between the image-side surface of the first lens element and the object-side surface of the second lens element, T3 is thickness of the second lens element, T4 is distance between the image-side surface of the second lens element and an image surface, and T is total track length of the optical lens assembly such that T=T1+T2+T3+T4;
• and wherein T1, T2, T3 and T4 are distances measured between points of intersection of respective lens surfaces and optical axis of the optical lens assembly.