Optical imaging lens assembly

1. An optical imaging lens assembly comprising, sequentially along an optical axis from an object side to an image side,

a first lens having a refractive power;

a second lens having a positive refractive power;

a third lens having a refractive power;

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, wherein an image-side surface of the seventh lens is a convex surface; and

an eighth lens having a refractive power;

wherein there is an air spacing between any two adjacent lenses in the first to eighth lenses, and

a total effective focal length f of the optical imaging lens assembly and an entrance pupil diameter EPD of the optical imaging lens assembly satisfy: f/EPD≥2.0,

wherein a sagittal height SAG 82 of an image-side surface of the eighth lens at a maximum effective semi-diameter, and the center thickness CT 8 of the eighth lens on the optical axis satisfy: −3.0<SAG 82 /CT 8 <−1.5.

2. The optical imaging lens assembly according to claim 1 , wherein the total effective focal length f of the optical imaging lens assembly and an effective focal length f 2 of the second lens satisfy: 1.0<f/f 2 <1.5.

3. The optical imaging lens assembly according to claim 2 , wherein the effective focal length f 2 of the second lens and a center thickness CT 2 of the second lens on the optical axis satisfy: 5.5≤f 2 /CT 2 <6.5.

4. The optical imaging lens assembly according to claim 1 , wherein an object-side surface of the first lens is a convex surface, and

the total effective focal length f of the optical imaging lens assembly and a radius of curvature R 1 of the object-side surface of the first lens satisfy: 2<f/R 1 <2.5.

5. The optical imaging lens assembly according to claim 1 , wherein an image-side surface of the eighth lens is a concave surface, and

the total effective focal length f of the optical imaging lens assembly and a radius of curvature R 16 of the image-side surface of the eighth lens satisfy: 1.5<f/R 16 <3.0.

6. The optical imaging lens assembly according to claim 5 , wherein the radius of curvature R 16 of the image-side surface of the eighth lens and a radius of curvature R 14 of the image-side surface of the seventh lens satisfy: 1.0<|R 16 /R 14 |<1.5.

7. The optical imaging lens assembly according to claim 1 , wherein an effective focal length f 8 of the eighth lens and a center thickness CT 8 of the eighth lens on the optical axis satisfy: −11<f 8 /CT 8 <− 7 .

8. The optical imaging lens assembly according to claim 1 , wherein a total track length TTL of the optical imaging lens assembly and half of a diagonal length ImgH of an effective pixel area on an image plane of the optical imaging lens assembly satisfy: TTL/ImgH<1.50.

9. The optical imaging lens assembly according to claim 8 , wherein the center thickness CT 2 of the second lens on the optical axis and a center thickness CT 3 of the third lens on the optical axis satisfy: 2.5<CT 2 /CT 3 <3.5.

10. An optical imaging lens assembly comprising, sequentially along an optical axis from an object side to an image side,

a first lens having a refractive power, wherein an object-side surface of the first lens is a convex surface;

a second lens having a positive refractive power, wherein an object-side surface of the second lens is a convex surface;

a third lens having a refractive power;

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, wherein an image-side surface of the seventh lens is a convex surface; and

an eighth lens having a refractive power, wherein an image-side surface of the eighth lens is a concave surface;

wherein a total effective focal length f of the optical imaging lens assembly, an effective focal length f 1 of the first lens, and an effective focal length f 2 of the second lens satisfy: 1.0<|f/f 1 |+|f/f 2 |<1.5,

wherein a sagittal height SAG 82 of the image-side surface of the eighth lens at a maximum effective semi-diameter, and the center thickness CT 8 of the eighth lens on the optical axis satisfy: −3.0<SAG 82 /CT 8 <−1.5.

11. The optical imaging lens assembly according to claim 10 , wherein the effective focal length f 2 of the second lens and a center thickness CT 2 of the second lens on the optical axis satisfy: 5.5<f 2 /CT 2 <6.5.

12. The optical imaging lens assembly according to claim 10 , wherein the total effective focal length f of the optical imaging lens assembly and the effective focal length f 2 of the second lens satisfy: 1.0<f/f 2 <1.5.

13. The optical imaging lens assembly according to claim 10 , wherein an effective focal length f 8 of the eighth lens and a center thickness CT 8 of the eighth lens on the optical axis satisfy: −11<f 8 /CT 8 <−7.

14. The optical imaging lens assembly according to claim 10 , wherein the total effective focal length f of the optical imaging lens assembly and a radius of curvature R 1 of the object-side surface of the first lens satisfy: 2<f/R 1 <2.5.

15. The optical imaging lens assembly according to claim 10 , wherein the total effective focal length f of the optical imaging lens assembly and a radius of curvature R 16 of the image-side surface of the eighth lens satisfy: 1.5<f/R 16 <3.0.

16. The optical imaging lens assembly according to claim 10 , wherein a radius of curvature R 16 of the image-side surface of the eighth lens and a radius of curvature R 14 of the image-side surface of the seventh lens satisfy: 1.0<IR 16 /R 141 <1.5.

17. The optical imaging lens assembly according to claim 10 , wherein a center thickness CT 2 of the second lens on the optical axis and a center thickness CT 3 of the third lens on the optical axis satisfy: 2.5<CT 2 /CT 3 <3.5.

18. The optical imaging lens assembly according to claim 14 , wherein a total track length TTL of the optical imaging lens assembly and half of a diagonal length ImgH of an effective pixel area on an image plane of the optical imaging lens assembly satisfy: TTL/ImgH≤1.50.