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Home > Spherical Lens > BK7 Negative Meniscus 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 Negative Meniscus 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 Negative Meniscus Lens | |||||||
| Part No. | Dia(mm) | EFL(mm) | R1(mm) | R2(mm) | CT(mm) | ET(mm) | BFL(mm) |
| NMK25100 | 25.40 | -100.00 | -33.65 | -100.00 | 3.00 | 4.70 | -103.03 |
| NMK25125 | 25.40 | -125.00 | -38.77 | -100.00 | 3.00 | 4.30 | -128.29 |
| NMK25150 | 25.40 | -150.00 | -43.14 | -100.00 | 3.00 | 4.10 | -153.54 |
| NMK25200 | 25.40 | -200.00 | -50.23 | -100.00 | 3.00 | 3.80 | -204.06 |
| NMK25250 | 25.40 | -250.00 | -55.71 | -100.00 | 3.00 | 3.70 | -254.57 |
| NMK25300 | 25.40 | -300.00 | -95.11 | -250.00 | 3.00 | 3.50 | -303.22 |
| NMK25400 | 25.40 | -400.00 | -112.49 | -250.00 | 3.00 | 3.40 | -403.63 |
| NMK25500 | 25.40 | -500.00 | -126.34 | -250.00 | 3.00 | 3.30 | -504.04 |
| NMK25110 | 25.40 | -1000.00 | -253.20 | -500.00 | 3.00 | 3.20 | -1004.03 |
| NMK50100 | 50.80 | -100.00 | -40.61 | -200.00 | 5.00 | 12.30 | -104.19 |
| NMK50125 | 50.80 | -125.00 | -48.29 | -200.00 | 5.00 | 10.60 | -129.40 |
| NMK50150 | 50.80 | -150.00 | -55.21 | -200.00 | 5.50 | 9.60 | -155.08 |
| NMK50200 | 50.80 | -200.00 | -67.42 | -200.00 | 5.00 | 8.40 | -205.04 |
| NMK50250 | 50.80 | -250.00 | -77.67 | -200.00 | 5.00 | 7.70 | -255.47 |
| NMK50300 | 50.80 | -300.00 | -101.41 | -300.00 | 5.00 | 7.20 | -305.03 |
| NMK50400 | 50.80 | -400.00 | -121.46 | -300.00 | 5.00 | 6.60 | -405.60 |
| NMK50500 | 50.80 | -500.00 | -137.79 | -300.00 | 5.00 | 6.30 | -506.17 |
| NMK50110 | 50.80 | -1000.00 | -252.85 | -500.00 | 5.00 | 5.60 | -1006.72 |