Optical imaging lens group

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

• a first lens, having a refractive power, an object-side surface of the first lens being a concave surface;
• a second lens, having a refractive power;
• a third lens, having a refractive power, an image-side surface of the third lens being a concave surface;
• a fourth lens, having a refractive power;
• a fifth lens, having a refractive power;
• a sixth lens, having a refractive power;
• a seventh lens, having a refractive power;
• and
• an eighth lens, having a refractive power,
• wherein half of a maximal field-of-view Semi-FOV of the optical imaging system satisfies:
• Semi-FOV>60°;
• and
• a center thickness CT1 of the first lens on the optical axis, a center thickness CT2 of the second lens on the optical axis, a center thickness CT3 of the third lens on the optical axis and a center thickness CT4 of the fourth lens on the optical axis satisfy:
• 0.3<(CT1+CT2)/(CT3+CT4)<0.8.