Camera optical lens

1. A camera optical lens comprising eight lenses which are, from an object side to an image side in sequence: a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a negative refractive power, a fourth lens having a positive refractive power, a fifth lens having a positive refractive power, a sixth lens having a refractive power, a seventh lens having a negative refractive power and an eighth lens having a negative refractive power;

wherein the camera optical lens satisfies following conditions:

0.95≤ f/TTL;

−5.00≤ f 2/ f≤− 2.00; and

0.40≤( R 9+ R 10)/( R 9− R 10)≤1.00;

where

TTL denotes a total optical length from an object-side surface of the first lens to an image surface of the camera optical lens along an optical axis;

f denotes a focal length of the camera optical lens;

f2 denotes a focal length of the second lens;

R9 denotes a central curvature radius of an object-side surface of the fifth lens; and

R10 denotes a central curvature radius of an image-side surface of the fifth lens.

2. The camera optical lens according to claim 1 , wherein the camera optical lens further satisfies the following condition:

0.10≤ d 13/ d 14≤1.30;

where

d13 denotes an on-axis thickness of the seventh lens; and

d14 denotes an on-axis distance from an image-side surface of the seventh lens to an object-side surface of the eighth lens.

3. The camera optical lens according to claim 1 , wherein the camera optical lens further satisfies following conditions:

0.23≤ f 1/ f≤ 1.11;

−4.40≤( R 1+ R 2)/( R 1− R 2)≤−0.47; and

0.04≤ d 1/ TTL≤ 0.14;

where

f1 denotes a focal length of the first lens;

R1 denotes a central curvature radius of the object-side surface of the first lens;

R2 denotes a central curvature radius of an image-side surface of the first lens; and

d1 denotes an on-axis thickness of the first lens.

4. The camera optical lens according to claim 1 , wherein the camera optical lens further satisfies following conditions:

−1.32≤( R 3+ R 4)/( R 3− R 4)≤13.70; and

0.02≤ d 3/ TTL≤ 0.06;

where

R3 denotes a central curvature radius of an object-side surface of the second lens;

R4 denotes a central curvature radius of an image-side surface of the second lens; and

d3 denotes an on-axis thickness of the second lens.

5. The camera optical lens according to claim 1 , wherein the camera optical lens further satisfies following conditions:

−49.20≤ f 3/ f≤− 0.96;

0.33≤( R 5+ R 6)/( R 5− R 6)≤39.23; and

0.02≤ d 5/ TTL≤ 0.09;

where

f3 denotes a focal length of the third lens;

R5 denotes a central curvature radius of an object-side surface of the third lens;

R6 denotes a central curvature radius of an image-side surface of the third lens; and

d5 denotes an on-axis thickness of the third lens.

6. The camera optical lens according to claim 1 , wherein the camera optical lens further satisfies following conditions:

0.55≤ f 4/ f≤ 12.72;

0.64≤( R 7+ R 8)/( R 7− R 8)≤9.96; and

0.02≤ d 7/ TTL≤ 0.11;

where

f4 denotes a focal length of the fourth lens;

R7 denotes a central curvature radius of an object-side surface of the fourth lens;

R8 denotes a central curvature radius of an image-side surface of the fourth lens; and

d7 denotes an on-axis thickness of the fourth lens.

7. The camera optical lens according to claim 1 , wherein the camera optical lens further satisfies following conditions:

1.00≤ f 5/ f≤ 21.01; and

0.02≤ d 9/ TTL≤ 0.08;

where

f5 denotes a focal length of the fifth lens; and

d9 denotes an on-axis thickness of the fifth lens.

8. The camera optical lens according to claim 1 , wherein the camera optical lens further satisfies following conditions:

−12.41≤ f 6/ f≤ 33.12;

−63.27≤( R 11+ R 12)/( R 11− R 12)≤37.28; and

0.04≤ d 11/ TTL≤ 0.19;

where

f6 denotes a focal length of the sixth lens;

R11 denotes a central curvature radius of an object-side surface of the sixth lens;

R12 denotes a central curvature radius of an image-side surface of the sixth lens; and

d11 denotes an on-axis thickness of the sixth lens.

9. The camera optical lens according to claim 1 , wherein the camera optical lens further satisfies following conditions:

−3.19≤ f 7/ f≤− 0.43;

−1.07≤( R 13+ R 14)/( R 13− R 14)≤1.26; and

0.02≤ d 13/ TTL≤ 0.28;

where

f7 denotes a focal length of the seventh lens;

R13 denotes a central curvature radius of an object-side surface of the seventh lens;

R14 denotes a central curvature radius of an image-side surface of the seventh lens; and

d13 denotes an on-axis thickness of the seventh lens.

10. The camera optical lens according to claim 1 , wherein the camera optical lens further satisfies following conditions:

−2.44≤ f 8/ f≤− 0.45;

0.95≤( R 15+ R 16)/( R 15− R 16)≤3.81; and

0.03≤ d 15/ TTL≤ 0.10;

where

f8 denotes a focal length of the eighth lens;

R15 denotes a central curvature radius of an object-side surface of the eighth lens;

R16 denotes a central curvature radius of an image-side surface of the eighth lens; and

d15 denotes an on-axis thickness of the eighth lens.