Optical system

1. An optical system for imaging an object on an image acquisition unit, comprising:

only three lens units disposed from the object in the direction of the image acquisition unit, namely a first lens unit, a second lens unit, and a third lens unit,

wherein the second lens unit and the third lens unit are movably situated along an optical axis of the optical system for zooming,

wherein the first lens unit includes a first lens group and a second lens group only, the first lens group of the first lens unit being fixedly situated on the optical axis of the optical system, and the second lens group of the first lens unit being movably situated along the optical axis of the optical system for focusing,

wherein the first lens group includes at least three lenses, the second lens group includes at least two lenses, and wherein the image acquisition unit is a surface sensor.

2. The optical system as recited in claim 1 , wherein the first lens unit is a converging first lens unit, wherein the second lens unit is a dispersive second lens unit, and wherein the third lens unit is a converging third lens unit.

3. The optical system as recited in claim 1 , wherein the surface sensor is at least one of: a charge-coupled device (CCD) and a complementary metal oxide semiconductor (CMOS) sensor.

4. An optical system for imaging an object on an image acquisition unit, comprising:

only three lens units disposed from the object in the direction of the image acquisition unit, namely a first lens unit, a second lens unit, and a third lens unit,

wherein the second lens unit and the third lens unit are movably situated along an optical axis of the optical system for zooming,

wherein the first lens unit includes a first lens group and a second lens group only, the first lens group of the first lens unit being fixedly situated on the optical axis of the optical system, and the second lens group of the first lens unit being movably situated along the optical axis of the optical system for focusing,

wherein the first lens group includes at least three lenses,

wherein the second lens group includes at least two lenses,

wherein the first lens group of the first lens unit is a converging first lens group, and

wherein the second lens group of the first lens unit is a dispersive second lens group.

5. The telescope as recited in claim 4 , wherein the at least one image acquisition unit is an ocular.

6. An optical system for imaging an object on an image acquisition unit, comprising:

only three lens units disposed from the object in the direction of the image acquisition unit, namely a first lens unit, a second lens unit, and a third lens unit,

wherein the second lens unit and the third lens unit are movably situated along an optical axis of the optical system for zooming,

wherein the first lens unit includes a first lens group and a second lens group only, the first lens group of the first lens unit being fixedly situated on the optical axis of the optical system, and the second lens group of the first lens unit being movably situated along the optical axis of the optical system for focusing,

wherein the first lens group includes at least three lenses,

wherein the second lens group includes at least two lenses,

wherein the first lens group of the first lens unit includes:

a first lens that is a converging lens;

a second lens that is a converging lens; and

a third lens that is a dispersive lens,

and wherein the second lens group of the first lens unit includes:

a fourth lens that is a converging lens; and

a fifth lens that is a dispersive lens.

7. The optical system as recited in claim 6 , wherein the second lens group is a cemented element.

8. The optical system as recited in claim 6 , wherein the second lens unit includes:

a sixth lens that is a dispersive lens;

a seventh lens that is a dispersive lens; and

an eighth lens that is a converging lens.

9. The optical system as recited in claim 8 , wherein the seventh lens and the eighth lens form a dispersive cemented element.

10. The optical system as recited in claim 6 , wherein the third lens unit includes:

a ninth lens that is a converging lens;

a tenth lens that is a dispersive lens;

an eleventh lens that is a converging lens;

a twelfth lens that is a converging lens; and

a thirteenth lens that is a dispersive lens.

11. An optical system for imaging an object on an image acquisition unit, comprising:

three lens units disposed from the object in the direction of the image acquisition unit, namely a first lens unit, a second lens unit, and a third lens unit,

wherein the second lens unit and the third lens unit are movably situated along an optical axis of the optical system for zooming,

wherein the first lens unit includes a first lens group and a second lens group, the first lens group of the first lens unit being fixedly situated on the optical axis of the optical system, and the second lens group of the first lens unit being movably situated along the optical axis of the optical system for focusing,

wherein the second lens group includes at least two lenses,

wherein the third lens unit includes:

a ninth lens that is a converging lens;

a tenth lens that is a dispersive lens;

an eleventh lens that is a converging lens;

a twelfth lens that is a converging lens; and

a thirteenth lens that is a dispersive lens, and

wherein the twelfth lens and the thirteenth lens form a dispersive cemented element.

12. An optical system for imaging an object on an image acquisition unit, comprising:

three lens units disposed from the object in the direction of the image acquisition unit, namely a first lens unit, a second lens unit, and a third lens unit,

wherein the second lens unit and the third lens unit are movably situated along an optical axis of the optical system for zooming,

wherein the first lens unit includes a first lens group and a second lens group, the first lens group of the first lens unit being fixedly situated on the optical axis of the optical system, and the second lens group of the first lens unit being movably situated along the optical axis of the optical system for focusing,

wherein the second lens group includes at least two lenses,

wherein the first lens group of the first lens unit includes:

a first lens that is a converging lens;

a second lens that is a converging lens; and

a third lens that is a dispersive lens,

wherein the second lens group of the first lens unit includes:

a fourth lens that is a converging lens; and

a fifth lens that is a dispersive lens,

wherein the second lens unit includes:

a sixth lens that is a dispersive lens;

a seventh lens that is a dispersive lens; and

an eighth lens that is a converging lens,

and wherein the third lens unit includes:

a ninth lens that is a converging lens;

a tenth lens that is a dispersive lens;

an eleventh lens that is a converging lens;

a twelfth lens that is a converging lens; and

a thirteenth lens that is a dispersive lens.

13. The optical system as recited in claim 12 ,

wherein the second lens is manufactured from a material whose deviation of the relative partial dispersion fulfills the following condition:

Δθ gF >0.025,

wherein the third lens is manufactured from a material whose deviation of the relative partial dispersion fulfills the following condition:

Δθ gF <−0.005,

wherein the fifth lens is manufactured from a material whose deviation of the relative partial dispersion fulfills the following condition:

Δθ gF <−0.005,

wherein the eleventh lens is manufactured from a material whose deviation of the relative partial dispersion fulfills the following condition:

Δθ gF >0.004,

wherein the twelfth lens is manufactured from a material whose deviation of the relative partial dispersion fulfills the following condition:

Δθ gF >0.004,

and wherein the thirteenth lens is manufactured from a material whose deviation of the relative partial dispersion fulfills the following condition:

Δθ gF >−0.005.

14. The optical system as recited in claim 12 , wherein the first lens unit the second lens unit, and the third lens unit, and the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, the eleventh lens, the twelfth lens, and the thirteenth lens have the following properties:

Face

Radii

Distances [mm]

n e

ν e

Δθ gF

Glass

First face

193.452

8.800

1.489150

70.2

0.0022

S-FSL5

of the first

lens

Second

−461.963

0.300

face of the

first lens

First face

133.330

13.800

1.498450

81.1

0.0280

S-FPL51

of the

second

lens

Second

−203.627

1.300

face of the

second

lens

First face

−199.963

4.300

1.616690

44.0

−0.0065

S-NBM51

of the third

lens

Second

199.963

89.054

face of the

third lens

First face

172.546

8.400

1.624090

33.5

0.0070

S-TIM2

of the

fourth lens

First face

−60.561

2.400

1.616690

44.0

−0.0065

S-NBM51

of the fifth

lens

Second

76.744

D9

face of the

fifth lens

First face

8008.430

2.300

1.489150

70.2

0.0022

S-FSL5

of the sixth

lens

Second

97.756

5.000

face of the

sixth lens

First face

−107.668

2.000

1.732340

54.4

−0.0086

S-LAL18

of the

seventh

lens

First face

68.366

5.000

1.812640

25.2

0.0158

S-TIH6

of the

eighth lens

Second

346.508

D14

face of the

eighth lens

First face

116.707

5.000

1.591430

60.6

−0.0018

S-BAL35

of the ninth

lens

Second

−150.657

6.000

face of the

ninth lens

First face

−45.364

3.500

1.761670

27.3

0.0133

S-TIH4

of the tenth

lens

Second

−59.427

0.500

face of the

tenth lens

First face

65.995

5.000

1.620330

63.0

0.0051

S-PHM52

of the

eleventh

lens

Second

−202.293

0.500

face of the

eleventh

lens

First face

54.889

5.500

1.620330

63.0

0.0051

S-PHM52

of the

twelfth

lens

First face

−223.543

2.000

1.616690

44.0

−0.0065

S-NBM51

of the

thirteenth

lens

Second

31.631

D23GBE

face of the

thirteenth

lens

f′ [mm]

167.3

334.6

501.9

D9 [mm]

35.773

76.325

119.468

D14 [mm]

101.408

42.598

13.255

D23GBE [mm]

110.217

128.476

114.676

Entrance pupil

38.44

65.3

85.0

diameter [mm]

Relative aperture

1:4.4

1:5.1

1:5.9

2 * Sigma

4.5°

2.25°

1.5°

Focal length first lens unit [mm]

502.73

Focal length first lens group [mm]

251.95

Focal length second lens group [mm]

−243.67

Focal length second lens unit [mm]

−75.78

Focal length third lens unit [mm]

82.14

wherein 2*Sigma is an aperture angle of an object side of the optical system.

15. A telescope, comprising:

at least one image acquisition unit; and

an objective that is implemented as an optical system, the optical system including:

only three lens units disposed from an object in the direction of the at least one image acquisition unit, namely a first lens unit, a second lens unit, and a third lens unit,

wherein the second lens unit and the third lens unit are movably situated along an optical axis of the optical system for zooming,

wherein the first lens unit includes a first lens group and a second lens group only, the first lens group of the first lens unit being fixedly situated on the optical axis of the optical system, and the second lens group of the first lens unit being movably situated along the optical axis of the optical system for focusing,

wherein the first lens group includes at least three lenses, the second lens group includes at least two lenses, and wherein the at least one image acquisition unit is a surface sensor.

16. The telescope as recited in claim 15 , wherein the surface sensor is at least one of: a charge-coupled device (CCD) and a complementary metal oxide semiconductor (CMOS) sensor.

17. The telescope as recited in claim 15 , further comprising:

a prism reversal system.

18. A telescope, comprising:

at least one image acquisition unit; and

an objective that is implemented as an optical system, the optical system including:

three lens units disposed from an object in the direction of the at least one image acquisition unit, namely a first lens unit, a second lens unit, and a third lens unit,

wherein the second lens unit and the third lens unit are movably situated along an optical axis of the optical system for zooming,

wherein the first lens unit includes a first lens group and a second lens group, the first lens group of the first lens unit being fixedly situated on the optical axis of the optical system, and the second lens group of the first lens unit being movably situated along the optical axis of the optical system for focusing,

wherein the second lens group includes at least two lenses,

wherein the first lens group of the first lens unit includes:

a first lens that is a converging lens;

a second lens that is a converging lens; and

a third lens that is a dispersive lens,

wherein the second lens group of the first lens unit includes:

a fourth lens that is a converging lens; and

a fifth lens that is a dispersive lens,

wherein the second lens unit includes:

a sixth lens that is a dispersive lens;

a seventh lens that is a dispersive lens; and

an eighth lens that is a converging lens,

and wherein the third lens unit includes:

a ninth lens that is a converging lens;

a tenth lens that is a dispersive lens;

an eleventh lens that is a converging lens;

a twelfth lens that is a converging lens; and

a thirteenth lens that is a dispersive lens.

19. An optical system for imaging an object on an image acquisition unit, comprising:

only three lens units disposed from the object in the direction of the image acquisition unit, namely a first lens unit, a second lens unit, and a third lens unit,

wherein the second lens unit and the third lens unit are movably situated along an optical axis of the optical system for zooming,

wherein the first lens unit includes a first lens group and a second lens group only, the first lens group of the first lens unit being fixedly situated on the optical axis of the optical system, and the second lens group of the first lens unit being movably situated along the optical axis of the optical system for focusing,

wherein the first lens group includes at least three lenses,

wherein the second lens group includes at least two lenses, and

wherein the second lens group is a dispersive second lens group.

20. An optical system for imaging an object on an image acquisition unit, comprising:

only three lens units disposed from the object in the direction of the image acquisition unit, namely a first lens unit, a second lens unit, and a third lens unit,

wherein the second lens unit and the third lens unit are movably situated along an optical axis of the optical system for zooming,

wherein the first lens unit includes a first lens group and a second lens group only, the first lens group of the first lens unit being fixedly situated on the optical axis of the optical system, and the second lens group of the first lens unit being movably situated along the optical axis of the optical system for focusing,

wherein the first lens group includes at least three lenses,

wherein the second lens group includes at least two lenses,

wherein a relative aperture of the optical system is variable, and

wherein the image acquisition unit is a surface sensor.