Optical imaging lens group

An optical imaging lens group, sequentially from an object side to an image side of the optical imaging lens group along an optical axis, comprising:

• a first lens having positive refractive power with a convex object-side surface;
• a second lens having refractive power;
• a third lens having refractive power;
• a fourth lens having refractive power;
• a fifth lens having refractive power;
• and
• a sixth lens having negative refractive power with a concave object-side surface and a convex image-side surface,
• wherein TTL/ImgH <1.4, and
• f*tan(Semi-FOV) >4.5 mm,
• where Semi-FOV is half of a maximal field-of-view of the optical imaging lens group, f is a total effective focal length of the optical imaging lens group, TTL is a distance along the optical axis from the object-side surface of the first lens to an imaging plane of the optical imaging lens group, and ImgH is half of a diagonal length of an effective pixel area on the imaging plane of the optical imaging lens group.