Imaging lens and imaging apparatus
View Patent ↗Provided are an imaging lens and an Imaging apparatus which includes this imaging lens. The imaging lens consists of, in order from an object side: a front group GF; a diaphragm St; and a rear group GR. The front group GF consists of, in order from the object side: a first lens L 1 that is convex toward the object side and has a negative refractive power; a second lens L 2 that has a negative refractive power; and a third lens L 3 that has a positive refractive power. The rear group GR consists of, in order from the object side: a fourth lens L 4 that has a positive refractive power; a fifth lens L 5 that has a positive refractive power; a sixth lens L 6 that has a negative refractive power; a seventh lens L 7 that has a positive refractive power; and an eighth lens L 8 that has a negative refractive power.
1. An imaging lens consisting of, in order from an object side:
a front group;
a diaphragm; and
a rear group,
wherein the front group consists of, in order from the object side, a first lens that is convex toward the object side and has a negative refractive power, a second lens that has a negative refractive power, and a third lens that has a positive refractive power, and
wherein the rear group consists of, in order from the object side, a fourth lens that has a positive refractive power, a fifth lens that has a positive refractive power, a sixth lens that has a negative refractive power, a seventh lens that has a positive refractive power, and an eighth lens that has a negative refractive power.
2. The imaging lens according to claim 1 ,
wherein the following conditional expression (1) is satisfied,
−0.4< f/fF<− 0.1 (1),
where f is a focal length of a whole system, and
fF is a focal length of the front group.
3. The imaging lens according to claim 2 ,
wherein the following conditional expression (2) is satisfied,
0.36< f/fR< 0.57 (2),
where f is the focal length of the whole system
fR is a focal length of the rear group.
4. The imaging lens according to claim 3 ,
wherein the following conditional expression (3) is satisfied,
0.65< D 34/ f< 1.5 (3),
where D 34 is an air gap on an optical axis between the third lens and the fourth lens, and
f is the focal length of the whole system.
5. The imaging lens according to claim 3 ,
wherein the following conditional expression (4) is satisfied,
100<2ω (4),
where 2ω is a total angle of view in a unit of degree (°).
6. The imaging lens according to claim 2 ,
wherein the following conditional expression (3) is satisfied,
0.65< D 34/ f< 1.5 (3),
where D 34 is an air gap on an optical axis between the third lens and the fourth lens, and
f is the focal length of the whole system.
7. The imaging lens according to claim 6 ,
wherein the following conditional expression (4) is satisfied,
100<2ω (4),
where 2ω is a total angle of view in a unit of degree (°).
8. The imaging lens according to claim 2 ,
wherein the following conditional expression (4) is satisfied,
100<2ω (4),
where 2ω is a total angle of view in a unit of degree (°).
9. The imaging lens according to claim 2 ,
wherein the following conditional expression (1-1) is satisfied,
−0.27< f/fF<− 0.14 (1-1).
10. The imaging lens according to claim 1 ,
wherein the following conditional expression (2) is satisfied,
0.36< f/fR< 0.57 (2),
where f is the focal length of the whole system
fR is a focal length of the rear group.
11. The imaging lens according to claim 10 ,
wherein the following conditional expression (3) is satisfied,
0.65< D 34/ f< 1.5 (3),
where D 34 is an air gap on an optical axis between the third lens and the fourth lens, and
f is the focal length of the whole system.
12. The imaging lens according to claim 11 ,
wherein the following conditional expression (4) is satisfied,
100<2ω (4),
where 2ω is a total angle of view in a unit of degree (°).
13. The imaging lens according to claim 10 ,
wherein the following conditional expression (4) is satisfied,
100<2ω (4),
where 2ω is a total angle of view in a unit of degree (°).
14. The imaging lens according to claim 10 ,
wherein the following conditional expression (2-1) is satisfied,
0.41< f/fR< 0.52 (2-1).
15. The imaging lens according to claim 1 ,
wherein the following conditional expression (3) is satisfied,
0.65< D 34/ f< 1.5 (3),
where D 34 is an air gap on an optical axis between the third lens and the fourth lens, and
f is the focal h of the whole system.
16. The imaging lens according to claim 15 ,
wherein the following conditional expression (4) is satisfied,
100<2ω (4),
where 2ω is a total angle of view in a unit of degree (°).
17. The imaging lens according to claim 15 ,
wherein the following conditional expression (3-1) is satisfied,
0.79< D 34/ f< 1.17 (3-1).
18. The imaging lens according to claim 1 ,
wherein the following conditional expression (4) is satisfied,
100<2ω (4),
where 2ω is a total angle of view in a unit of degree (°).
19. The imaging lens according to claim 9 ,
wherein the following conditional expression (4-1) is satisfied,
110<2ω (4-1).
20. An imaging apparatus comprising the imaging lens according to claim 1 .