Zoom lens and image pickup apparatus using the same

1. A zoom lens comprising, in order from an object side:

a first lens unit having a positive focal length;

a second lens unit having a negative focal length;

a third lens unit having a positive focal length;

a fourth lens unit having a negative focal length; and

a fifth lens unit having a positive focal length,

wherein

at a time of zooming from a wide angle end to a telephoto end, air spaces between lens units among the first through fifth lens units change, and

following Conditional Expressions (1) and (2) are satisfied:

0.3 ≤D 34 W/D 45 W≤ 1  (1), and

0.2≤( D 34 W/D 45 W )/( D 34 T/D 45 T )≤0.6  (2),

where,

D34W is an air space on an optical axis between the third lens unit and the fourth lens unit at the wide angle end;

D45W is an air space on the optical axis between the fourth lens unit and the fifth lens unit at the wide angle end;

D34T is an air space on the optical axis between the third lens unit and the fourth lens unit at the telephoto end; and

D45T is an air space on the optical axis between the fourth lens unit and the fifth lens unit at the telephoto end.

2. The zoom lens according to claim 1 , wherein

at the time of zooming from the wide angle end to the telephoto end,

an air space between the first lens unit and the second lens unit widens,

an air space between the second lens unit and the third lens unit narrows,

an air space between the third lens unit and the fourth lens unit widens, and

an air space between the fourth lens unit and the fifth lens unit widens.

3. The zoom lens according to claim 1 , wherein

following Conditional Expression (3) is satisfied:

0.7 ≤D 34 T/D 45 T≤ 2  (3),

where,

D34T is the air space on the optical axis between the third lens unit and the fourth lens unit at the telephoto end; and

D45T is the air space on the optical axis between the fourth lens unit and the fifth lens unit at the telephoto end.

4. The zoom lens according to claim 1 , wherein

following Conditional Expression (4) is satisfied:

0.1≤(β4 T/β 4 W )/( fT/fW )≤0.2  (4),

where,

β4W is a lateral magnification of the fourth lens unit at the wide angle end;

β4T is a lateral magnification of the fourth lens unit at the telephoto end;

fW is a focal length of the entire zoom lens at the wide angle end; and

fT is a focal length of the entire zoom lens at the telephoto end.

5. The zoom lens according to claim 1 , wherein

following Conditional Expression (5) is satisfied:

0.23≤(β3 T/β 3 W )/( fT/fW )≤0.55  (5),

where,

β3W is a lateral magnification of the third lens unit at the wide angle end;

β3T is a lateral magnification of the third lens unit at the telephoto end;

fW is a focal length of the entire zoom lens at the wide angle end; and

fT is a focal length of the entire zoom lens at the telephoto end.

6. The zoom lens according to claim 1 , wherein

following Conditional Expression (6) is satisfied:

0.6≤(β2 W/β 3 W )/(β2 T/β 3 T )≤1.7  (6),

where,

β2W is a lateral magnification of the second lens unit at the wide angle end;

β3W is a lateral magnification of the third lens unit at the wide angle end;

β2T is a lateral magnification of the second lens unit at the telephoto end; and

β3T is a lateral magnification of the third lens unit at the telephoto end.

7. The zoom lens according to claim 1 , wherein

following Conditional Expression (7) is satisfied:

0.2 ≤f 3 G/fT≤ 0.33  (7),

where,

f3G is a focal length of the third lens unit; and

fT is a focal length of the entire zoom lens at the telephoto end.

8. The zoom lens according to claim 1 , wherein

following Conditional Expression (8) is satisfied:

0.38 ≤DG 3 W/LW≤ 0.58  (8),

where,

DG3W is a distance on the optical axis from a surface closest to an object in the third lens unit to an image plane at the wide angle end; and

LW is a distance on the optical axis from an object-side surface top of a lens element disposed closest to the object in the first lens unit to the image plane at the wide angle end.

9. The zoom lens according to claim 1 , wherein

any one lens unit of the first lens unit, the second lens unit, the third lens unit, the fourth lens unit, and the fifth lens unit has a moving lens component which moves in a direction vertical to the optical axis, and

following Conditional Expression (9) is satisfied:

1.2 ≤fIS/fISG≤ 3  (9),

where,

fIS is a focal length of the moving lens component; and

fISG is a focal length of a lens unit having the moving lens component.

10. The zoom lens according to claim 1 , wherein

the third lens unit has a moving lens component which moves in a direction vertical to the optical axis.

11. The zoom lens according to claim 1 , wherein

following Conditional Expression (10) is satisfied:

0.45 ≤DG 3 T/LT≤ 0.6  (10),

where,

DG3T is a distance on the optical axis from a surface closest to an object in the third lens unit to an image plane at the telephoto end; and

LT is a distance on the optical axis from an object-side surface top of a lens element disposed closest to the object in the first lens unit to the image plane at the telephoto end.

12. The zoom lens according to claim 1 , wherein

following Conditional Expression (11) is satisfied:

0.1 ≤DG 5 T/LT≤ 0.25  (11),

where,

DGST is a distance on the optical axis from an object-side surface top of a lens element disposed closest to the object in the fifth lens unit to an image plane at the telephoto end; and

LT is a distance on the optical axis from an object-side surface top of a lens element disposed closest to the object in the first lens unit to the image plane at the telephoto end.

13. The zoom lens according to claim 1 , wherein

following Conditional Expression (12) is satisfied:

0.5≤( RG 41 +RG 42)/( RG 41 −RG 42)≤1.7  (12),

where,

RG41 is a radius of curvature of an object-side surface of a lens element positioned closest to the object in the fourth lens unit; and

RG42 is a radius of curvature of an image-side surface of a lens element positioned closest to an image in the fourth lens unit.

14. The zoom lens according to claim 1 , wherein

following Conditional Expression (13) is satisfied:

−0.7≤( RG 51 +RG 52)/( RG 51 −RG 52)≤0.7  (13),

where,

RG51 is a radius of curvature of an object-side surface of a lens element positioned closest to the object in the fifth lens unit; and

RG52 is a radius of curvature of an image-side surface of a lens element positioned closest to an image in the fifth lens unit.

15. The zoom lens according to claim 1 , wherein

following Conditional Expression (14) is satisfied:

−2.5 ≤fT/ExpT≤ 0.3  (14),

where,

fT is a focal length of the entire zoom lens at the telephoto end; and

ExpT is an exit pupil position with respect to a paraxial imaging plane at the telephoto end.

16. An image pickup apparatus comprising:

the zoom lens of claim 1 ; and

an image pickup element which converts an image formed by the zoom lens to an electrical signal.

17. A zoom lens comprising, in order from an object side:

a first lens unit having a positive focal length;

a second lens unit having a negative focal length;

a third lens unit having a positive focal length;

a fourth lens unit having a negative focal length; and

a fifth lens unit having a positive focal length,

wherein

at a time of zooming from a wide angle end to a telephoto end, air spaces between lens units among the first through fifth lens units change, and

the third lens unit includes, in order from the object side:

a first positive lens component,

a second positive lens component which is disposed on an image side of the first positive lens component with an air space,

a first negative lens component which is disposed on an image side of the second positive lens component with an air space, and

a third positive lens component which is disposed on an image side of the first negative lens component with an air space, and

a total number of lens elements included in the third lens unit are five or more.

18. The zoom lens according to claim 17 , wherein

at the time of zooming from the wide angle end to the telephoto end,

an air space between the first lens unit and the second lens unit widens,

an air space between the second lens unit and the third lens unit narrows,

an air space between the third lens unit and the fourth lens unit widens, and

an air space between the fourth lens unit and the fifth lens unit widens.

19. The zoom lens according to claim 17 , wherein

following Conditional Expression (4) is satisfied:

0.1≤(β4 T/β 4 W )/( fT/fW )≤0.2  (4),

where,

β4W is a lateral magnification of the fourth lens unit at the wide angle end;

β4T is a lateral magnification of the fourth lens unit at the telephoto end;

fW is a focal length of the entire zoom lens at the wide angle end; and

fT is a focal length of the entire zoom lens at the telephoto end.

20. The zoom lens according to claim 17 , wherein

following Conditional Expression (A2) is satisfied:

45 ≤νdG 3 P   (A2),

where,

vdG3P is a smallest Abbe number, of Abbe numbers on d-line of the positive lens elements disposed in the third lens unit.

21. The zoom lens according to claim 17 , wherein

following Conditional Expression (5) is satisfied:

0.23≤(β3 T/β 3 W )/( fT/fW )≤0.55  (5),

where,

β3W is a lateral magnification of the third lens unit at the wide angle end;

β3T is a lateral magnification of the third lens unit at the telephoto end;

fW is a focal length of the entire zoom lens at the wide angle end; and

fT is a focal length of the entire zoom lens at the telephoto end.

22. The zoom lens according to claim 17 , wherein

following Conditional Expression (6) is satisfied:

0.6≤(β2 W/β 3 W )/(β2 T/β 3 T )≤1.7  (6),

where,

β2W is a lateral magnification of the second lens unit at the wide angle end;

β3W is a lateral magnification of the third lens unit at the wide angle end;

β2T is a lateral magnification of the second lens unit at the telephoto end; and

β3T is a lateral magnification of the third lens unit at the telephoto end.

23. The zoom lens according to claim 17 , wherein

following Conditional Expression (7) is satisfied:

0.2 ≤f 3 G/fT≤ 0.33  (7),

where,

f3G is a focal length of the third lens unit; and

fT is a focal length of the entire zoom lens at the telephoto end.

24. The zoom lens according to claim 17 , wherein

following Conditional Expression (8) is satisfied:

0.38 ≤DG 3 W/LW≤ 0.58  (8),

where,

DG3W is a distance on an optical axis from a surface closest to an object in the third lens unit to an image plane at the wide angle end; and

LW is a distance on the optical axis from an object-side surface top of a lens component disposed closest to the object in the first lens unit to the image plane at the wide angle end,

wherein

in a predetermined arrangement, DG3W is a distance on the optical axis from a surface including an aperture of an aperture stop to the image plane at the wide angle end, and

the predetermined arrangement is an arrangement having the aperture stop disposed immediately at front of the object side of the first positive lens component, and moves integrally with the first positive lens component in an optical axis direction.

25. The zoom lens according to claim 17 , wherein

following Conditional Expression (10) is satisfied:

0.45 ≤DG 3 T/LT≤ 0.6  (10),

where,

DG3T is a distance on an optical axis from a surface closest to an object in the third lens unit to an image plane at the telephoto end; and

LT is a distance on the optical axis from an object-side surface top of a lens component disposed closest to the object in the first lens unit to the image plane at the telephoto end,

wherein

in a predetermined arrangement, DG3T is a distance on the optical axis from a surface including an aperture of an aperture stop to the image plane at the telephoto end, and

the predetermined arrangement is an arrangement having the aperture stop disposed immediately at front of the object side of the first positive lens component, and moves integrally with the first positive lens component in an optical axis direction.

26. The zoom lens according to claim 17 , wherein

following Conditional Expression (A8) is satisfied:

1.5 ≤DG 3 L 12 /DG 3 L 23≤70  (A8),

where,

DG3L12 is a distance on an optical axis of an air space between a lens component disposed first from the object side and a lens component disposed second from the object side in the third lens unit; and

DG3L23 is a distance on the optical axis of an air space between a lens component disposed second from the object side and a lens component disposed third from the object side in the third lens unit.

27. The zoom lens according to claim 17 , wherein

following Conditional Expression (A9) is satisfied:

0.35 ≤DG 3 L 1 F 2 R/DG 3≤0.6  (A9),

where,

DG3L1F2R is a distance on an optical axis from an object-side surface top of a lens component disposed closest to an object to an image-side surface top of a lens component disposed second from the object side in the third lens unit; and

DG3 is a distance on the optical axis from a surface closest to the object to a surface closest to an image in the third lens unit,

wherein

in a predetermined arrangement, DG3 is a distance on the optical axis from a surface including an aperture of an aperture stop to an image plane, and

the predetermined arrangement is an arrangement having the aperture stop disposed immediately at front of the object side of the first positive lens component, and moves integrally with the first positive lens component in an optical axis direction.

28. The zoom lens according to claim 17 , wherein

following Conditional Expression (A10) is satisfied:

0.85 ≤f 1 G/fT≤ 1.65  (A10),

where,

f1G is a focal length of the first lens unit; and

fT is a focal length of the entire zoom lens at the telephoto end.

29. The zoom lens according to claim 17 , wherein

following Conditional Expression (A11) is satisfied:

0.2≤( RG 21+ RG 22)/( RG 21− RG 22)≤1.8  (A11),

where,

RG21 is a radius of curvature of an object-side surface of a lens component positioned closest to an object in the second lens unit; and

RG22 is a radius of curvature of an image-side surface of a lens component positioned closest to an image in the second lens unit.

30. The zoom lens according to claim 17 , wherein following Conditional Expression (14) is satisfied:

−2.5 ≤fT/ExpT≤ 0.3  (14),

where,

fT is a focal length of the entire zoom lens at the telephoto end; and

ExpT is an exit pupil position with respect to a paraxial imaging plane at the telephoto end.

31. The zoom lens according to claim 17 , further comprising a moving lens component which moves in a direction vertical to the optical axis, and

wherein following Conditional Expression (9) is satisfied:

1.2 ≤fIS/fISG≤ 3  (9),

where,

fIS is a focal length of the moving lens component; and

fISG is a focal length of a lens unit having the moving lens component.

32. The zoom lens according to claim 17 , wherein at least one of lens components disposed in the third lens unit moves in a direction vertical to an optical axis.

33. The zoom lens according to claim 17 , wherein

a lens component positioned closest to an image in the third lens unit is a lens component having a positive focal length,

the lens component positioned closest to the image in the third lens unit moves in a direction vertical to an optical axis, and

lens components having a negative focal length are disposed on both the object side and an image side of the lens component positioned closest to the image in the third lens unit.

34. The zoom lens according to claim 17 , wherein

a predetermined lens component disposed in the third lens unit moves in a direction vertical to an optical axis, and

following Conditional Expression (A14) is satisfied:

0.04≤((1 −βISW )×β RW ))/ fW≤ 0.15  (A14),

where,

βISW is a lateral magnification at the wide angle end of the predetermined lens component;

βRW is a lateral magnification at the wide angle end of all of lens units positioned closer to an image than the predetermined lens component; and

fW is a focal length of the entire zoom lens at the wide angle end.

35. The zoom lens according to claim 17 , wherein

a lens component disposed in the third lens unit is moved in a direction vertical to an optical axis, and

following Conditional Expression (A15) is satisfied:

−3 ≤fG 3 R 2 /fG 3 R 1≤−0.5  (A15),

where,

fG3R1 is a focal length of a lens component disposed closest to an image in the third lens unit; and

fG3R2 is a focal length of a lens component disposed second from the image side in the third lens unit.

36. An image pickup apparatus comprising:

the zoom lens of claim 17 ; and

an image pickup element which converts an image formed by the zoom lens to an electrical signal.

37. A zoom lens comprising, in order from an object side,

a first lens unit having a positive focal length;

a second lens unit having a negative focal length;

a third lens unit having a positive focal length;

a fourth lens unit having a negative focal length; and

a fifth lens unit having a positive focal length,

wherein

at a time of zooming from a wide angle end to a telephoto end, air spaces between lens units among the first through fifth lens units change,

the third lens unit includes a positive lens component, a positive lens component, a negative lens component, and a positive lens component in order from the object side,

the negative lens component in the third lens unit is a cemented lens component including a negative lens element and a positive lens element in order from the object side,

the cemented lens component is a meniscus-shaped lens component having a convex surface directed toward the object side,

a lens unit positioned closest to an image includes an arrangement in which a negative lens element and a positive lens element are disposed in order from the object side, and

a lens unit disposed second from the image side with an air space interposed includes an arrangement in which a negative lens element and a positive lens element are disposed in order.

38. The zoom lens according to claim 37 , wherein the lens unit positioned closest to the image has a cemented lens component including the negative lens element and the positive lens element cemented together.

39. The zoom lens according to claim 37 , wherein the lens unit disposed second from the image side with an air space interposed has a cemented lens component including the negative lens element and the positive lens element cemented together.

40. The zoom lens according to claim 37 , wherein

the lens unit positioned closest to the image side includes two lens elements in total, and

the lens unit disposed second from the image side with an air space interposed includes two lens elements in total.

41. The zoom lens according to claim 37 , wherein

at the time of zooming from the wide angle end to the telephoto end,

an air space between the first lens unit and the second lens unit widens,

an air space between the second lens unit and the third lens unit narrows,

an air space between the third lens unit and the fourth lens unit widens, and

an air space between the fourth lens unit and the fifth lens unit widens.

42. The zoom lens according to claim 37 , wherein

the third lens unit further includes a predetermined lens component,

the predetermined lens component includes a lens element having a negative focal length and a lens element having a positive focal length in order from the object side, and

the predetermined lens component or the cemented lens component moves in a direction vertical to an optical axis.

43. The zoom lens according to claim 37 , wherein the cemented lens component in the third lens unit moves in a direction vertical to an optical axis.

44. The zoom lens according to claim 37 , wherein

following Conditional Expression (B1) is satisfied:

0.3≤(β4 T/β 4 W )/(β2 T/β 2 W )≤0.55  (B1),

where,

β2W is a lateral magnification of the second lens unit at the wide angle end;

β2T is a lateral magnification of the second lens unit at the telephoto end;

β4W is a lateral magnification of the fourth lens unit at the wide angle end; and

β4T is a lateral magnification of the fourth lens unit at the telephoto end.

45. The zoom lens according to claim 37 , wherein

following Conditional Expression (B2) is satisfied:

0.25≤(β4 T/β 4 W )/(β3 T/β 3 W )≤0.5  (B2),

where,

β3W is a lateral magnification of the third lens unit at the wide angle end;

β3T is a lateral magnification of the third lens unit at the telephoto end;

β4W is a lateral magnification of the fourth lens unit at the wide angle end; and

β4T is a lateral magnification of the fourth lens unit at the telephoto end.

46. The zoom lens according to claim 37 , wherein

the fourth lens unit is the lens unit disposed second from the image side with an air space interposed, and

following Conditional Expressions (B3) and (B4) are satisfied:

vdG 4 P≤ 45  (B3), and

where,

vdG4P is Abbe number on d-line of the positive lens element disposed in the fourth lens unit; when the fourth lens unit has a plurality of positive lens elements, vdG4P is a smallest Abbe number of respective Abbe numbers on d-line; and

vdG4N is an Abbe number on d-line of the negative lens element disposed in the fourth lens unit; when the fourth lens unit has a plurality of negative lens elements, vdG4N is a smallest Abbe number of respective Abbe numbers on d-line.

47. The zoom lens according to claim 37 , wherein

the fourth lens unit is the lens unit disposed second from the image side with an air space interposed, and

following Conditional Expression (B5) is satisfied:

−10≤( RG 4 PF+RG 4 PR )/( RG 4 PF−RG 4 PR )≤−1  (B5),

where,

RG4PF is a radius of curvature of an object-side surface of the positive lens element in the fourth lens unit; and

RG4PR is a radius of curvature of an image-side surface of the positive lens element in the fourth lens unit.

48. The zoom lens according to claim 37 , wherein

the fourth lens unit is the lens unit disposed second from the image side with an air space interposed, and

following Conditional Expression (B6) is satisfied:

−2.5 ≤f 4 G/fW≤− 1.6  (B6),

where,

f4G is a focal length of the fourth lens unit; and

fW is a focal length of the entire zoom lens at the wide angle end.

49. The zoom lens according to claim 37 , wherein

the fourth lens unit is the lens unit disposed second from the image side with an air space interposed,

the negative lens element in the fourth lens unit is disposed closest to an object, and

following Conditional Expression (B7) is satisfied:

0.2 ≤DG 4 W/LW≤ 0.4  (B7),

where,

DG4W is a distance on an optical axis from an image-side surface top of the negative lens element disposed closest to the object in the fourth lens unit to an image plane at the wide angle end; and

LW is a distance on the optical axis from an object-side surface top of a lens element disposed closest to the object in the first lens unit to the image plane at the wide angle end.

50. The zoom lens according to claim 37 , wherein

following Conditional Expression (4) is satisfied:

0.1≤(β4 T/β 4 W )/( fT/fW )≤0.2  (4),

where,

β4W is a lateral magnification of the fourth lens unit at the wide angle end;

β4T is a lateral magnification of the fourth lens unit at the telephoto end;

fW is a focal length of the entire zoom lens at the wide angle end; and

fT is a focal length of the entire zoom lens at the telephoto end.

51. The zoom lens according to claim 37 , wherein

following Conditional Expression (12) is satisfied:

0.5≤( RG 41 +RG 42)/( RG 41 −RG 42)≤1.7  (12),

where,

RG41 is a radius of curvature of an object-side surface of a lens element positioned closest to the object in the fourth lens unit; and

RG42 is a radius of curvature of an image-side surface of a lens element positioned closest to an image in the fourth lens unit.

52. The zoom lens according to claim 37 , wherein

following Conditional Expression (13) is satisfied:

−0.7≤( RG 51 +RG 52)/( RG 51 −RG 52)≤0.7  (13),

where,

RG51 is a radius of curvature of an object-side surface of a lens element positioned closest to the object in the fifth lens unit; and

RG52 is a radius of curvature of an image-side surface of a lens element positioned closest to an image in the fifth lens unit.

53. The zoom lens according to claim 37 , wherein

following Conditional Expression (5) is satisfied:

0.23≤(β3 T/β 3 W )/( fT/fW )≤0.55  (5),

where,

β3W is a lateral magnification of the third lens unit at the wide angle end;

β3T is a lateral magnification of the third lens unit at the telephoto end;

fW is a focal length of the entire zoom lens at the wide angle end; and

fT is a focal length of the entire zoom lens at the telephoto end.

54. The zoom lens according to claim 37 , wherein

following Conditional Expression (7) is satisfied:

0.2 ≤f 3 G/fT≤ 0.33  (7),

where,

f3G is a focal length of the third lens unit; and

fT is a focal length of the entire zoom lens at the telephoto end.

55. The zoom lens according to claim 37 , wherein

following Conditional Expression (6) is satisfied:

0.6≤(β2 W/β 3 W )/(β2 T/β 3 T )≤1.7  (6),

where,

β2W is a lateral magnification of the second lens unit at the wide angle end;

β3W is a lateral magnification of the third lens unit at the wide angle end;

β2T is a lateral magnification of the second lens unit at the telephoto end; and

β3T is a lateral magnification of the third lens unit at the telephoto end.

56. The zoom lens according to claim 37 , wherein

following Conditional Expression (14) is satisfied:

−2.5 ≤fT/ExpT≤ 0.3  (14),

where,

fT is a focal length of the entire zoom lens at the telephoto end; and

ExpT is an exit pupil position with respect to a paraxial imaging plane at the telephoto end.

57. The zoom lens according to claim 37 , wherein

any one lens unit of the first lens unit, the second lens unit, the third lens unit, the fourth lens unit, and the fifth lens unit has a moving lens component which moves in a direction vertical to the optical axis, and

following Conditional Expression (9) is satisfied:

1.2 ≤fIS/fISG≤ 3  (9),

where,

fIS is a focal length of the moving lens component; and

fISG is a focal length of a lens unit having the moving lens component.

58. The zoom lens according to claim 37 , wherein any lens component disposed in the third lens unit moves in a direction vertical to an optical axis.

59. An image pickup apparatus comprising:

the zoom lens of claim 37 ; and

an image pickup element which converts an image formed by the zoom lens to an electrical signal.

60. A zoom lens comprising, in order from an object side:

a first lens unit having a positive focal length;

a second lens unit having a negative focal length;

a third lens unit having a positive focal length;

a fourth lens unit having a negative focal length; and

a fifth lens unit having a positive focal length,

wherein

at a time of zooming from a wide angle end to a telephoto end, air spaces between lens units among the first through fifth lens units change,

the third lens unit includes a first positive lens component, a second positive lens component, a first negative lens component, and a third positive lens component, in order from the object side, and

following Conditional Expression (4) is satisfied:

0.1≤(β4 T/β 4 W )/( fT/fW )≤0.2  (4),

where,

β4W is a lateral magnification of the fourth lens unit at the wide angle end;

β4T is a lateral magnification of the fourth lens unit at the telephoto end;

fW is a focal length of the entire zoom lens at the wide angle end; and

fT is a focal length of the entire zoom lens at the telephoto end.

61. A zoom lens comprising, in order from an object side:

a first lens unit having a positive focal length;

a second lens unit having a negative focal length;

a third lens unit having a positive focal length;

a fourth lens unit having a negative focal length; and

a fifth lens unit having a positive focal length,

wherein

at a time of zooming from a wide angle end state to a telephoto end state, air spaces between lens units among the first through fifth lens units change,

the third lens unit includes a first positive lens component, a second positive lens component, a first negative lens component, and a third positive lens component, in order from the object side,

an air space between the first lens unit and the second lens unit is wider in the telephoto end state as compared to the wide angle end state,

an air space between the second lens unit and the third lens unit narrower in the telephoto end state as compared to the wide angle end state,

an air space between the third lens unit and the fourth lens unit is wider in the telephoto end state as compared to the wide angle end state,

an air space between the fourth lens unit and the fifth lens unit is wider in the telephoto end state as compared to the wide angle end state,

the first lens unit is positioned closer to the object side in the telephoto end state than in the wide angle end state,

the third lens unit is positioned closer to the object side in the telephoto end state than in the wide angle end state, and

the fourth lens unit is positioned closer to the object side in the telephoto end than in the wide angle end state.

62. The zoom lens according to claim 17 , wherein the third lens unit includes six lens elements.