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ST-147A optical resin lens-Table 4

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In the design of the telescope, in order to shorten the light path, shorten the lens body and increase the brightness, one field lens is often introduced into the eyepiece. The field lens is a positive lens (convex lens). ST-147A field lens is almost used for 8×40 zoom binocular telescopes. Its parameters are as follows:
Outside diameter ø=21mm Effective apertureD0=20mm  
Center thickness=5.8mm Edge thickness=1.65mm  

Focal length f'=29.057

Front intercept sf=-27.74mm

Back intercept sf'=26.32mm

 

Lifesize field lens

Table 4 Data of“STOEMI” optical resin lens

No.

Name

Type

f′

sf

sf′

D0

OD(Φ)

Center thickness

Edge thickness

Picture

ST-146

Eyepiece of viewfinder

Plano-convex

108.59

-105.51

108.59

21.1×14.2

3.9

2.5

   

ST-147

Field lens

Double convex

25.78

-24.33

22.78

20

21

6.4

1.5

 

ST-147A

Field lens

Double convex

29.057

-27.74

26.32

20

21

5.8

1.65

ST-148-1.5X

Biocular magnifier

Plano-convex

494.61

-494.61

491.59

74.5×28.4

4.5

3

 

ST-148-2X

Biocular magnifier

Plano-convex

248.48

-248.48

245.46

74.5×28.4

4.5

3

 

ST-148-3X

Biocular magnifier

Plano-convex

167.22

-167.22

164.2

74.5×28.4

4.5

3

 

ST-149

Hydrological encoder

Plane ring

 

 

 

65

65×1.5

3孔

1.5

 

ST-150

Field lens

Aspheric

79.5

-73.6

82.29

20

21

4

2.95

 

ST-151

Camera objectvie lens

Ceniscus

20.5

-21.5

18.39

6

7

1.8

1.13

 

ST-152

Extended lens

Ceniscus

-40.53

39.96

-41.78

7

8

1

1.44

 

ST-153

Protection lens

Plane

 

 

 

 

13

1.5

1.5

 

ST-154

Reflection lens

Plano-convex

 

 

 

 

11×6.5

1.2

1.2

 

ST-155

Splitting lens

Plane

 

 

  

24.4×22.7×1

1

1

 

ST-156

Back window

Plane

 

 

 

24.4×17.5×0.72

0.72

0.72

 

ST-157

Aspheric reflection lens

Double convex

 

  

 

26×17

2.5

 

 

ST-158

Concave lens

Double concave

737.5

 

 

100

103

2.5

6

 

ST-159

7×50 field lens

Double convex

45.6

-42.95

44.28

24

26

5.8

1.83

 

ST-160

Filter

Red, yellow, orange

 

 

 

18

19

1.5

1.5

 

ST-161

Eyepiece of viewfinder

Plano-convex

30.152

-30.152

28.509

10×7

2.45

1.58

 

ST-162

Objective lens of viewfinder

Aspheric

-11.559

11.674

-12.973

15.5×10

2.3

2.5

 

ST-163

Lens

Ceniscus

30.606

-33.21

26.6

8.5

11

2.6

1.66

 

ST-164

Objective lens of viewfinder

Plano-concave

-14.66

15.67

-14.66

6×10

2.33

5

 

ST-165

Objective lens 2

Double concave

-34.38

34.85

-34.85

12×9

2.3

2.94

 

ST-166

Eyepiece of viewfinder

Plano-convex

24.906

-22.69

24.906

12×9

3.3

2.44

 

ST-167

Objective lens of viewfinder

Plano-concave

-28.31

 

-27.7

16.2×11

1.25

3.82

 

ST-168

Eyepiece of viewfinder

Plano-convex

54.778

 

53.5

12.3×8.3

2

1.5

 

ST-169

Camera lens

Ceniscus

31

-32.77

28.19

8.5

11.9

1.77

1.11

 

ST-170

Objective lens of viewfinder

Double concave

 

 

-51.5

22.5×16

2.1

5

 

ST-171

Eyepiece of viewfinder

Plano-convex

75.76

 

72.4

19×14

3.2

2.2

 

ST-172

Objective lens of viewfinder

Plano-concave

12.125

 

11.9

16.8×11.3

2

6

 

ST-173

Eyepiece of viewfinder

Double convex

29.16

 

26.8

12.8×7.5

3.8

2.8

 

ST-174

Camera lens 1

Ceniscus

43.8

-48.32

38.73

7

10.6

2.33

1.1

 

ST-175

Camera lens 2

Ceniscus

60.54

-59.25

61.1

5.3

10.4

1.08

1.33

 

ST-176

Field lens

Double convex

34.133

-32.14

32.544

20.5

21.5

5.2

1.56

 

ST-177

Field lens

Double convex

31.15

-30.88

29.05

15

16

3.5

1.28

 

ST-178

Camera lens 1

Ceniscus

18.86

-19.28

16.878

9.08

11.6

2.4

2.21

 

ST-179

Camera lens 2

Double concave

-11.82

12.06

-11.9

5.7

11.6

0.5

0.91

 

ST-180

Camera lens 3

Double convex

16.292

-15.87

15.9

4.5

8.87

1.2

1.18

 

ST-181

Camera lens 1

Ceniscus

16.653

-17.33

13.554

8.2

13.45

3.8

1.67

 

ST-182

Camera lens 2

Double concave

-9.654

10.152

-9.69

6.8

11.3

.85

0.95

 

ST-183

Camera lens 3

Double convex

17.334

-17.13

16.617

5.4

10.35

 

1.45

 

ST-184

Objective lens of viewfinder

Ceniscus

45.324

46.46

-45.19

16.4×11

1.03

0.9

 

ST-185

Camera lens 1

Ceniscus

35.71

-38.34

31.86

8.8

9.79

2.26

1.68

 

ST-186

Camera lens 2

Ceniscus

68.966

-65.98

70.7

3.3

8

1.98

1.92

 

ST-187

Objective lens of viewfinder

Aspheric

-28.88

-29.68

-28.88

18.8×11

1.6

3.68

 

ST-188

Eyepiece of viewfinder

Plano-convex

45.14

-43.72

45.14

11.78×7.8

2.13

1.42

 

ST-189

Field lens

Ceniscus

41.84

-37.79

41.88

24

25

6

6.04

 

ST-190

NIR objective lens

Aspheric

84.82

-83.49

78.57

49

50

11.1

3.34

 

 

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