Zoom lens, optical apparatus and method for manufacturing the zoom lens
A zoom lens, comprises: in order from an object, a first lens group (G 1 ) having positive refractive power; a second lens group (G 2 ) having negative refractive power; a third lens group (G 3 ) having positive refractive power; a fourth lens group (G 4 ) having negative refractive power; and a fifth lens group (G 5 ) having positive refractive power, wherein, upon zooming from a wide-angle end state to a telephoto end state, a distance between each of lens groups and a lens group adjacent thereto changes to satisfy the following conditional expression: 2.90<| MV 5/ MV 2|<11.50 where, MV5 denotes, upon zooming from a wide-angle end state to a telephoto end state, a moving amount of the fifth lens group with an image surface as a reference; and MV2 denotes, upon zooming from the wide-angle end state to the telephoto end state, a moving amount of the second lens group with the image surface as the reference.
1. A zoom lens, comprising: in order from an object, a first lens group having positive refractive power; a second lens group having negative refractive power; a third lens group having positive refractive power; a fourth lens group having negative refractive power; and a fifth lens group having positive refractive power, wherein
upon zooming from a wide-angle end state to a telephoto end state,
a distance between each of lens groups and a lens group adjacent thereto changes to satisfy the following conditional expression:
2.90<| MV 5/ MV 2|<11.50
where,
MV5 denotes, upon zooming from the wide-angle end state to the telephoto end state, a moving amount of the fifth lens group with an image surface as a reference; and
MV2 denotes, upon zooming from the wide-angle end state to the telephoto end state, a moving amount of the second lens group with the image surface as a reference, and
wherein the following conditional expression is satisfied:
1.20<β2 t/β 2 w< 2.50
where,
β2t denotes a magnification of the second lens group in the telephoto end state; and
β2w denotes a magnification of the second lens group in the wide-angle end state.
2. The zoom lens according to claim 1 , which satisfies the following conditional expression:
6.00<| MV 4/ MV 2|<15.00
where,
MV4 denotes, upon zooming from the wide-angle end state to the telephoto end state, a moving amount of the fourth lens group with the image surface as a reference.
3. The zoom lens according to claim 1 , wherein, upon zooming from the wide-angle end state to the telephoto end state, the fifth lens group moves toward an image.
4. The zoom lens according to claim 1 , which satisfies the following conditional expression:
0.10<(β2 t×β 4 w )/(β2 w×β 4 t )<2.40
where,
β2t denotes a magnification of the second lens group in the telephoto end state;
β2w denotes a magnification of the second lens group in the wide-angle end state;
β4t denotes a magnification of the fourth lens group in the telephoto end state; and
β4w denotes a magnification of the fourth lens group in the wide-angle end state.
5. The zoom lens according to claim 1 , which satisfies the following conditional expression:
1.50< TLt/ft< 5.00
where,
TLt denotes a total length of the zoom lens in the telephoto end state; and
ft denotes a focal length of the zoom lens as a whole in the telephoto end state.
6. The zoom lens according to claim 1 , which satisfies the following conditional expression:
28.0<ω w< 65.0
where, ωw is a half angle of view (unit: degree) of the zoom lens as a whole in the wide-angle end state.
7. The zoom lens according to claim 1 , which satisfies the following conditional expression:
5.0<ω t< 25.0
where,
ωt denotes a half angle of view (unit: degree) of the zoom lens as a whole in the telephoto end state.
8. The zoom lens according to claim 1 , wherein at least part of the fourth lens group is moved for focusing.
9. The zoom lens according to claim 1 , wherein at least part of the third lens group comprises a component displaceable in a direction perpendicular to an optical axis.
10. An optical apparatus, comprising the zoom lens according to claim 1 .
11. A zoom lens, comprising: in order from an object, a first lens group having positive refractive power; a second lens group having negative refractive power; a third lens group having positive refractive power; a fourth lens group having negative refractive power; and a fifth lens group having positive refractive power, wherein
upon zooming from a wide-angle end state to a telephoto end state,
a distance between each of lens groups and a lens group adjacent thereto changes to satisfy the following conditional expression:
6.00<| MV 4/ MV 2|<15.00
where,
MV4 denotes, upon zooming from the wide-angle end state to the telephoto end state, a moving amount of the fourth lens group with an image surface as a reference; and
MV2 denotes, upon zooming from the wide-angle end state to the telephoto end state, a moving amount of the second lens group with the image surface as a reference, and
wherein the following conditional expression is satisfied:
1.20<β2 t/β 2 w< 2.50
where,
β2t denotes a magnification of the second lens group in the telephoto end state; and
β2w denotes a magnification of the second lens group in the wide-angle end state.
12. The zoom lens according to claim 11 , wherein, upon zooming from the wide-angle end state to the telephoto end state, the fifth lens group moves toward an image.
13. The zoom lens according to claim 11 , which satisfies the following conditional expression:
0.10<(β2 t×β 4 w )/(β2 w×β 4 t )<2.40
where,
β2t denotes a magnification of the second lens group in the telephoto end state;
β2w denotes a magnification of the second lens group in the wide-angle end state;
β4t denotes a magnification of the fourth lens group in the telephoto end state; and
β4w denotes a magnification of the fourth lens group in the wide-angle end state.
14. The zoom lens according to claim 11 , which satisfies the following conditional expression:
1.50< TLt/ft< 5.00
where,
TLt denotes a total length of the zoom lens in the telephoto end state; and
ft denotes a focal length of the zoom lens as a whole in the telephoto end state.
15. The zoom lens according to claim 11 , which satisfies the following conditional expression:
28.0<ω w< 65.0
where, ωw is a half angle of view (unit: degree) of the zoom lens as a whole in the wide-angle end state.
16. The zoom lens according to claim 11 , which satisfies the following conditional expression:
5.0<ω t< 25.0
where,
ωt denotes a half angle of view (unit: degree) of the zoom lens as a whole in the telephoto end state.
17. The zoom lens according to claim 11 , wherein at least part of the fourth lens group is moved for focusing.
18. The zoom lens according to claim 11 , wherein at least part of the third lens group comprises a component displaceable in a direction perpendicular to an optical axis.
19. An optical apparatus, comprising the zoom lens according to claim 11 .
20. A method for manufacturing a zoom lens which comprises, in order from an object, a first lens group having positive refractive power; a second lens group having negative refractive power; a third lens group having positive refractive power; a fourth lens group having negative refractive power; and the fifth lens group having positive refractive power,
the method comprising arranging the first to the fifth lens groups within a lens barrel in such a manner that:
upon zooming from a wide-angle end state to a telephoto end state, a distance between each of lens groups and a lens group adjacent thereto changes to satisfy the following conditional expression:
2.90<| MV 5/ MV 2|<11.50
where,
MV5 denotes, upon zooming from the wide-angle end state to the telephoto end state, a moving amount of the fifth lens group with an image surface as a reference; and
MV2 denotes, upon zooming from the wide-angle end state to the telephoto end state, a moving amount of the second lens group with the image surface as a reference,
the method further comprising satisfying the following conditional expression:
1.20<β2 t/β 2 w< 2.50
where,
β2t denotes a magnification of the second lens group in the telephoto end state; and
β2w denotes a magnification of the second lens group in the wide-angle end state.
21. A method for manufacturing a zoom lens which comprises, in order from an object, a first lens group having positive refractive power; a second lens group having negative refractive power; a third lens group having positive refractive power; a fourth lens group having negative refractive power; and a fifth lens group having positive refractive power,
the method comprising arranging the first to the fifth lens groups within a lens barrel in such a manner that:
upon zooming from a wide-angle end state to a telephoto end state, a distance between each of lens groups and a lens group adjacent thereto changes to satisfy the following conditional expression:
6.00<| MV 4/ MV 2|<15.00
where,
MV4 denotes, upon zooming from the wide-angle end state to the telephoto end state, a moving amount of the fourth lens group with an image surface as a reference; and
MV2 denotes, upon zooming from the wide-angle end state to the telephoto end state, a moving amount of the second lens group with the image surface as a reference,
the method further comprising satisfying the following conditional expression:
1.20<β2 t/β 2 w< 2.50
where,
β2t denotes a magnification of the second lens group in the telephoto end state; and
β2w denotes a magnification of the second lens group in the wide-angle end state.