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Home > Spherical Lens > BK7 Bi-concave lens
Material:BK7 grade A optical glass
Design Wavelength:632.8nm
Focal Length Tolerance:±1%
Diameter Tolerance:+0.0,-0.1mm
Center Thickness:±0.1mm
Surface Figure:λ/4@632.8nm
Surface Quality:40-20 scratch and dig
Centration:3 arc minutes
Clear Aperture:>90%
Bevel:<0.25mm x 45°
Coating:Specified by customer
| BK7 Bi-concave Lens |  |
Material:BK7 grade A optical glass Design Wavelength:632.8nm Focal Length Tolerance:±1% Diameter Tolerance:+0.0,-0.1mm Center Thickness:±0.1mm Surface Figure:λ/4@632.8nm Surface Quality:40-20 scratch and dig Centration:3 arc minutes Clear Aperture:>90% Bevel:<0.25mm x 45° Coating:Specified by customer| BK7 Bi-concave Lens | ||||||
| Part No. | Dia(mm) | EFL(mm) | R(mm) | CT(mm) | ET(mm) | BFL(mm) |
| DCK12025 | 12.70 | -25.00 | -26.17 | 2.50 | 4.10 | -25.81 |
| DCK12030 | 12.70 | -30.00 | -31.41 | 3.00 | 4.30 | -30.98 |
| DCK12050 | 12.70 | -50.00 | -52.10 | 3.50 | 4.30 | -51.14 |
| DCK25050 | 25.40 | -50.00 | -52.01 | 3.00 | 6.10 | -50.98 |
| DCK25075 | 25.40 | -75.00 | -77.85 | 3.50 | 5.60 | -76.15 |
| DCK25100 | 25.40 | -100.00 | -103.70 | 4.00 | 5.60 | -101.31 |