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Biconvex Lenses > BK7 Biconvex Lens

Introduction

Biconvex lenses are manufactured with an identical convex surface on both sides of the lens it has positive focal lengths and form both real and virtual images. Aberrations such as coma distortion and chromatic aberration almost exactly cancel out at unit conjugate ratios due to the symmetry. Aberrations will increase as conjugate ratios depart from unity.
 
 

Standard Specifications

  

 

Items

Specifications

Material

BK7 Grade A or equivalent Optical Glass

Designed Wavelength

546.1 nm

Designed Index

1.5183 ±0.0005

Dimension Tolerance

+0.0/-0.2 mm

Thickness Tolerance

± 0.2 mm

Paraxial Focal Length

± 2%

Clear Aperture

> 90%

Centration

3 arc minutes

Flatness

λ/4 at 632.8 nm

Surface Quality

scratch and dig 60-40

Bevel

0.5 (0/-0.3) mm

Notes:

1. Material, besides BK7, fused silica and any other materials are available.

2. Surface Quality could reach 40-20 or 20-10

3. Centration such as 1’, 30” is available.

4. Please show us the size and the coating specification.

  
   

 

Part NO.

f(mm)

ф (mm)

R(mm)

tc(mm)

te(mm)

fb(mm)

LBX0201

15.0

12.7

14.66

4.9

2.0

13.3

LBX0202

20.0

12.7

20.01

4.0

2.0

18.6

LBX0203

25.0

12.7

25.28

3.6

2.0

23.8

LBX0204

30.0

12.7

30.52

3.3

2.0

28.9

LBX0205

40.0

12.7

40.95

3.0

2.0

39.0

LBX0206

50.0

12.7

51.35

2.8

2.0

49.1

LBX0207

75.0

12.7

77.30

2.6

2.0

74.1

LBX0208

100.0

12.7

103.25

2.4

2.0

99.2

LBX0209

10.0

10.0

9.45

4.9

2.0

8.2

LBX0301

35.0

25.4

35.09

6.8

2.0

32.7

LBX0302

50.0

25.4

50.92

5.2

2.0

48.3

LBX0303

75.0

25.4

77.04

4.1

2.0

73.6

LBX0304

100.0

25.4

103.05

3.6

2.0

98.8

LBX0305

125.0

25.4

129.02

3.3

2.0

123.9

LBX0306

150.0

25.4

154.97

3.0

2.0

149.0

LBX0307

175.0

25.4

180.91

2.9

2.0

174.0

LBX0308

200.0

25.4

206.84

2.8

2.0

199.0

LBX0309

250.0

25.4

258.70

2.6

2.0

249.1

LBX0310

300.0

25.4

310.55

2.5

2.0

299.2

LBX0311

500.0

25.4

517.91

2.3

2.0

499.2

LBX0312

1000.0

25.4

1036.23

2.2

2.0

999.3

LBX0313

25.4

25.4

24.712

9.0

2.0

22.2

LBX0314

31.7

25.4

31.56

7.3

2.0

29.2

LBX0401

50.0

38.0

49.97

10.5

3.0

46.4

LBX0402

100.0

38.0

102.52

6.5

3.0

97.8

LBX0403

150.0

38.0

154.57

5.4

3.0

148.2

LBX0404

200.0

38.0

206.51

4.8

3.0

198.4

LBX0405

350.0

38.0

362.13

4.0

3.0

348.7

LBX0406

500.0

38.0

517.67

3.7

3.0

498.8

LBX0407

700.0

38.0

725.02

3.5

3.0

698.8

LBX0501

100.0

50.0

102.06

9.2

3.0

96.9

LBX0502

150.0

50.0

154.27

7.1

3.0

147.6

LBX0503

200.0

50.0

206.28

6.0

3.0

198.0

LBX0504

250.0

50.0

258.22

5.4

3.0

248.2

LBX0505

400.0

50.0

413.87

4.5

3.0

398.5

LBX0506

450.0

50.0

465.73

4.3

3.0

448.6

LBX0507

500.0

50.0

517.58

4.2

3.0

498.6

LBX0508

600.0

50.0

621.28

4.0

3.0

598.7

LBX0509

800.0

50.0

828.64

3.8

3.0

798.7

 

  

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