BK7 Bi-Concave Lenses

Material: BK7 grade A, fine annealed
Focal Length (f'): ±2%
Diameter (F): -0.10mm
Center Thickness (Tc): ±0.1mm
Centration: 3 arc minutes
Fringes: 1~5
Irregularity of Fringes: 0.1~0.5
Surface Quality: 20-10 scratch-dig
Coating: MgF2 AR coated
Clear Aperture: 90% F

DH-0404: Bi-Concave Lenses

Catalog No.

Ø

f'

fb

Tc

Te

DH-040401

6.0

-9.8

-10.4

2.0

2.9

DH-040424

10.0

-15.1

-15.8

2.0

3.6

DH-040423

10.0

-30.0

-30.7

2.0

2.8

DH-040402

12.7

-19.0

-19.7

2.0

4.2

DH-040403

12.7

-25.4

-26.0

2.0

3.6

DH-040404

12.7

-38.1

-38.8

2.0

3.0

DH-040422

20.0

-30.0

-30.8

2.7

6.0

DH-040421

20.0

-40.0

-40.9

2.7

5.1

DH-040420

20.0

-60.0

-61.2

2.7

4.3

DH-040405

25.4

-50.8

-51.8

3.0

6.2

DH-040406

25.4

-75.0

-76.3

3.0

5.1

DH-040407

25.4

-100.0

-101.7

3.0

4.6

DH-040408

25.4

-150.0

-150.9

3.0

4.1

DH-040419

30.0

-60.0

-61.3

3.5

7.1

DH-040418

30.0

-180.0

-181.1

3.5

4.7

DH-040417

30.0

-250.0

-251.3

3.5

4.4

DH-040409

38.1

-125.0

-126.5

4.0

6.8

DH-040410

38.1

-200.0

-201.6

4.0

5.8

DH-040411

38.1

-300.0

-301.5

4.0

5.2

DH-040416

40.0

-100.0

-101.4

4.0

7.9

DH-040415

40.0

-150.0

-151.4

4.0

6.6

DH-040412

50.8

-250.0

-251.5

5.0

7.5

DH-040413

50.8

-400.0

-401.6

5.0

6.6

DH-040414

50.8

-500.0

-501.7

5.0

6.3