BK7 Bi-concave Spherical Lenses
Material:BK7
Design Wavelength :632.8nm
Focal Length Tolerance :±1%
Diameter Tolerance :+0.0/-0.1mm
Thickness Tolerance :±0.1mm
Surface Accuracy :λ/4@632.8nm
Surface Quality :40-20
Centration :<3'
Clear Aperture :>90%
Bevelling :<0.2×45°
Coating :AR A:350-650nm
B:650-1050nm C:1050-1580nm
B:650-1050nm C:1050-1580nm
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BK7 Bi-concave Spherical Lenses
| NO. | Dia | EFL | R | Tc | Te | BFL |
| 11D1569R | 12.70 | -25.00 | -26.17 | 2.50 | 4.10 | -25.81 |
| 11D1903R | 12.70 | -30.00 | -31.41 | 3.00 | 4.30 | -30.97 |
| 11D1357R | 12.70 | -50.00 | -52.10 | 3.50 | 4.30 | -51.15 |
| 11D1464R | 25.40 | -50.00 | -52.01 | 3.00 | 6.10 | -50.98 |
| 11D1170R | 25.40 | -75.00 | -77.86 | 3.50 | 5.60 | -76.15 |
| 11D1613R | 25.40 | -100.00 | -103.69 | 4.00 | 5.60 | -101.31 |