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Negative Meniscus Lenses
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Specifications：
| Material | BK7 or UV fused silica |
| Focal Length Tolerance | ±1% @589nm |
| Design Wavelength | 589nm |
| Centration | ≤3′ |
| Diameter Tolerance | +0/-0.1mm |
| Clear Aperture | ≥ central 90% of diameter |
| Center Thickness Tolerance | ±0.1mm |
| Surface Quality | 20/10（UVFS）/ 40/20（BK7） |
| Surface Accuracy |
≤ 1.5λ power，λ/2 irregularity（UVFS） ≤ 1.5λ power，λ/4 irregularity（BK7） |
| Chamfers | 0-0.8mm face width×45°±15° |
Order Information：
BK7 Meniscus Lenses：
| Part Number | Dia(mm) | Tc(mm) | Te(mm) |
R1(mm) |
R2(mm) |
EFL(mm) |
Material |
| LNS-254-R950-R459-BK7 | 25.4 | 2.86 | 3.8 | 95.0 | -45.9 | -175.0 | BK7 |
| LNS-254-R1000-R431-BK7 | 25.4 | 3.73 | 4.77 | 100 | -43.11 | -150.0 | BK7 |
| LNS-254-R900-R373-BK7 | 25.4 | 2.02 | 3.3 | 100 | -38.973 | -125.0 | BK7 |
| LNS-254-R900-R326-BK7 | 25.4 | 2.32 | 3.92 | 100 | -33.8 | -100 | BK7 |
Note：
Other sizes and focal length are available upon request. Also the lens ring mounts are available upon request.
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