Zoom lens and optical apparatus having the same
At least one exemplary embodiment is directed to a zoom lens including a plurality of lens units, in which an interval between respective adjacent lens units varies during zooming, an aperture stop, and a refractive optical element made of a solid material having an Abbe number (νd) and a relative partial dispersion (θgF) satisfying the following condition: θ gF −(−1.665×10 −7 ·νd 3 +5.213×10 −5 ·νd 2 −5.656×10 −3 ·νd +0.755)>0. The refractive optical element is located at a position in which distances (dw, dt) from the aperture stop to the refractive optical element on an optical axis at a wide-angle end and a telephoto end, respectively, satisfy the following condition: dt/dw >1.1.
1. A zoom lens comprising:
a plurality of lens units, in which an interval between respective adjacent lens units varies during zooming;
an aperture stop; and
a refractive optical element made of a solid material having an Abbe number (νd) and a relative partial dispersion (θgF) satisfying the following condition:
θ gF −(−1.665×10 −7 ·νd 3 +5.213×10 −5 ·νd 2 −5.656×10 −3 ·νd+ 0.755)>0,
wherein the refractive optical element is located at a position in which distances (dw, dt) from the aperture stop to the refractive optical element on an optical axis at a wide-angle end and a telephoto end, respectively, satisfy the following condition:
dt/dw> 1.1,
wherein the refractive optical element has a negative refractive power and is located behind the aperture stop.
2. The zoom lens according to claim 1 , wherein the Abbe number (νd) and a relative partial dispersion (θgd) of the solid material satisfy the following condition:
θ gd −(−1.687×10 −7 ·νd 3 +5.702×10 −5 ·νd 2 −6.603×10 −3 ·νd+ 1.500)>0.
3. The zoom lens according to claim 1 , wherein the Abbe number (νd) of the solid material satisfies the following condition:
νd<60.
4. The zoom lens according to claim 1 , wherein an absolute value (|dn/dT|) of a rate of change of refractive index for d-line light of the solid material with respect to temperature change in a range of 0° to 40° C. satisfies the following condition:
| dn/dT|< 2.5×10 −4 (1/° C.).
5. The zoom lens according to claim 1 , wherein the zoom lens is adapted to form an image on a photoelectric conversion element.
6. An optical apparatus comprising:
the zoom lens according to claim 1 ; and
a photoelectric conversion element configured to receive an image formed by the zoom lens.
7. A zoom lens comprising:
a plurality of lens units, in which an interval between respective adjacent lens units varies during zooming;
an aperture stop; and
a refractive optical element made of a solid material having an Abbe number (νd) and a relative partial dispersion (θgF) satisfying the following condition:
θ gF −(−1.665×10 −7 ·νd 3 +5.213×10 −5 ·νd 2 −5.656×10 −3 ·νd+ 0.755)>0,
wherein the refractive optical element is located at a position in which distances (dw, dt) from the aperture stop to the refractive optical element on an optical axis at a wide-angle end and a telephoto end, respectively, satisfy the following condition:
dw/dt> 1.1,
wherein the refractive optical element has a negative refractive power and is located in front of the aperture stop.
8. The zoom lens according to claim 7 , wherein the Abbe number (νd) and a relative partial dispersion (θgd) of the solid material satisfy the following condition:
θ gd −(−1.687×10 −7 ·νd 3 +5.702×10 −5 ·νd 2 −6.603×10 −3 ·νd +1.500)>0.
9. The zoom lens according to claim 7 , wherein the Abbe number (νd) of the solid material satisfies the following condition:
νd<60.
10. The zoom lens according to claim 7 , wherein an absolute value (|dn/dT|) of a rate of change of refractive index for d-line light of the solid material with respect to temperature change in a range of 0° to 40° C. satisfies the following condition:
| dn/dT|< 2.5×10 −4 (1/° C.).
11. The zoom lens according to claim 7 , wherein the zoom lens is adapted to form an image on a photoelectric conversion element.
12. An optical apparatus comprising:
the zoom lens according to claim 7 ; and
a photoelectric conversion element configured to receive an image formed by the zoom lens.
13. A zoom lens comprising:
a lens unit having a negative refractive power;
a lens unit having a positive refractive power located behind the lens unit having a negative refractive power, in which zooming is performed by moving at least one of the two lens units along an optical axis;
an aperture stop; and
a refractive optical element made of a solid material having an Abbe number (νd) and a relative partial dispersion (θgF) satisfying the following condition:
θ gF −(−1.665×10 −7 ·νd 3 +5.213×10 −5 ·νd 2 −5.656×10 −3 ·νd+ 0.700)<0,
wherein the refractive optical element is located at a position in which distances (dw, dt) from the aperture stop to the refractive optical element on the optical axis at a wide-angle end and a telephoto end, respectively, satisfy the following condition:
dt/dw> 1.1,
wherein the refractive optical element has a negative refractive power and is located in front of the aperture stop.
14. The zoom lens according to claim 13 , wherein the zoom lens is adapted to form an image on a photoelectric conversion element.
15. An optical apparatus comprising:
the zoom lens according to claim 13 ; and
a photoelectric conversion element configured to receive an image formed by the zoom lens.
16. A zoom lens comprising:
a lens unit having a negative refractive power;
a lens unit having a positive refractive power located behind the lens unit having a negative refractive power, in which zooming is performed by moving at least one of the two lens units along an optical axis;
an aperture stop; and
a refractive optical element made of a solid material having an Abbe number (νd) and a relative partial dispersion (θgF) satisfying the following condition:
θ gF −(−1.665×10 −7 ·νd 3 +5.213×10 −5 ·νd 2 −5.656×10 −3 ·νd+ 0.700)<0,
wherein the refractive optical element is located at a position in which distances (dw, dt) from the aperture stop to the refractive optical element on the optical axis at a wide-angle end and a telephoto end, respectively, satisfy the following condition:
dw/dt> 1.1,
wherein the refractive optical element has a negative refractive power and is located behind the aperture stop.
17. The zoom lens according to claim 16 , wherein an absolute value (|dn/dT|) of a rate of change of refractive index for d-line light of the solid material with respect to temperature change in a range of 0° to 40° C. satisfies the following condition:
| dn/dT|< 2.5×10 −4 (1/° C.).
18. The zoom lens according to claim 16 , wherein the zoom lens is adapted to form an image on a photoelectric conversion element.
19. An optical apparatus comprising:
the zoom lens according to claim 16 ; and
a photoelectric conversion element configured to receive an image formed by the zoom lens.
20. A zoom lens comprising:
a plurality of lens units, in which an interval between respective adjacent lens units varies during zooming;
an aperture stop; and
a refractive optical element made of a solid material having an Abbe number (νd) and a relative partial dispersion (θgF) satisfying the following condition:
θ gF −(−1.665×10 −7 ·νd 3 +5.213×10 −5 ·νd 2 −5.656×10 −3 ·νd+ 0.755)>0,
wherein the refractive optical element is located at a position in which distances (dw, dt) from the aperture stop to the refractive optical element on an optical axis at a wide-angle end and a telephoto end, respectively, satisfy the following condition:
dt/dw> 1.1,
wherein the Abbe number (νd) and a relative partial dispersion (θgd) of the solid material satisfy the following condition:
θ gd −(−1.687×10 −7 ·νd 3 +5.702×10 −5 ·νd 2 −6.603×10 −3 ·νd+ 1.500)>0.
21. A zoom lens comprising:
a plurality of lens units, in which an interval between respective adjacent lens units varies during zooming;
an aperture stop; and
a refractive optical element made of a solid material having an Abbe number (νd) and a relative partial dispersion (θgF) satisfying the following condition:
θ gF −(−1.665×10 −7 ·νd 3 +5.213×10 −5 ·νd 2 −5.656×10 −3 ·νd+ 0.755)>0,
wherein the refractive optical element is located at a position in which distances (dw, dt) from the aperture stop to the refractive optical element on an optical axis at a wide-angle end and a telephoto end, respectively, satisfy the following condition:
dw/dt> 1.1,
wherein the Abbe number (νd) and a relative partial dispersion (θgd) of the solid material satisfy the following condition:
θ gd −(−1.687×10 −7 ·νd 3 +5.702×10 −5 ·νd 2 −6.603×10 −3 ·νd+ 1.500)>0.