Camera lens
The present disclosure provides a camera lens, constituted by eight lenses, and featuring excellent optical characteristics, an ultra-thin appearance, a wide angle and a bright Fno. The camera lens is configured with, sequentially from an object side: a 1st lens having a positive refractive power, a 2nd lens having a negative refractive power, a 3rd lens having a negative refractive power, a 4th lens having a positive refractive power, a 5th lens having a negative refractive power, a 6th lens having a positive refractive power, a 7th lens having a positive refractive power and an 8th lens having a negative refractive power, and satisfies specified conditional formulas.
1. A camera lens, configured with, sequentially from an object side: a 1st lens having a positive refractive power, a 2nd lens having a negative refractive power, a 3rd lens having a negative refractive power, a 4th lens having a positive refractive power, a 5th lens having a negative refractive power, a 6th lens having a positive refractive power, a 7th lens having a positive refractive power and an 8th lens having a negative refractive power, and satisfying conditional formulas (1) to (2) and (4) below:
0.20≤ R 1/ R 2≤0.50 (1);
1.00≤ R 3/ R 4≤1.40 (2);
−8.00≤ f 2/ f≤− 5.00 (4);
where,
f: a focal length of the overall camera lens;
f2: a focal length of the 2nd lens;
R1: a curvature radius of an object side surface of the 1st lens;
R2: a curvature radius of an image side surface of the 1st lens;
R3: a curvature radius of an object side surface of the 2nd lens;
R4: a curvature radius of an image side surface of the 2nd lens.
2. The camera lens according to claim 1 , wherein the camera lens satisfies a conditional formula (3) below:
1.00≤ f 1/ f 1.50 (3);
where,
f: a focal length of the overall camera lens;
f1: a focal length of the 1st lens.
3. The camera lens according to claim 1 , wherein the camera lens satisfies a conditional formula (5) below:
−8.00≤ f 3/ f≤− 5.00 (5);
where,
f: the focal length of the overall camera lens;
f3: a focal length of the 3rd lens.
4. The camera lens according to claim 1 , wherein the camera lens satisfies a conditional formula (6) below:
−3.00≤ R 13/ R 14≤−1.00 (6);
where,
R13: a curvature radius of an object side surface of the 7th lens;
R14: a curvature radius of an image side surface of the 7th lens.
5. The camera lens according to claim 1 , wherein the camera lens satisfies a conditional formula (7) below:
−3.00≤ R 15/ R 16≤1.00 (7);
where,
R15: a curvature radius of an object side surface of the 8th lens;
R16: a curvature radius of an image side surface of the 8th lens.