Fused Silica Biconcave Lenses
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Symmetrically concave negative lenses
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Ultra-Violet grade fused silica
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Focal lengths from -9.7 to -299.5mm
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Diameters from 10 to 50.8mm
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Complete range of optional Anti-Reflection coatings available
These biconcave lenses are used when a very high negative power is required. They can be used in a multi-element system or alone to produce a diverging cone or a virtual image.
Sharp edges, which are common in negative lenses, are removed by beveling to reduce the likelihood of chipping.
These lenses are provided uncoated, however a wide range of standard Anti-Reflection coatings are available for these lenses.
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| D (mm) | f (mm) | tc (mm) | te (mm) | fb (mm) | r (mm) | Centration (arcmin) | Surface Quality | Material | Coating | Focal Length tolerance | Clear Aperture (%) | Diameter tolerance | Thickness tolerance | Design Wavelength | Bevel |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 10.0 | -9.7 | 2.0 | 5.0 | -10.3 | 9.20 | ≤ 1 | 20 - 10 | SFS | none | ±1% | ≥ 85 | +0, -0.1mm | ±0.15mm | 546.1 | 0.2mm x 45° typical |
| 10.0 | -14.7 | 2.0 | 3.9 | -15.3 | 13.80 | ≤ 1 | 20 - 10 | SFS | none | ±1% | ≥ 85 | +0, -0.1mm | ±0.15mm | 546.1 | 0.2mm x 45° typical |
| 10.0 | -19.7 | 2.0 | 3.4 | -20.3 | 18.40 | ≤ 1 | 20 - 10 | SFS | none | ±1% | ≥ 85 | +0, -0.1mm | ±0.15mm | 546.1 | 0.2mm x 45° typical |
| 10.0 | -24.7 | 2.0 | 3.1 | -25.3 | 23.00 | ≤ 1 | 20 - 10 | SFS | none | ±1% | ≥ 85 | +0, -0.1mm | ±0.15mm | 546.1 | 0.2mm x 45° typical |
| 10.0 | -29.7 | 2.0 | 2.9 | -30.3 | 27.60 | ≤ 1 | 20 - 10 | SFS | none | ±1% | ≥ 85 | +0, -0.1mm | ±0.15mm | 546.1 | 0.2mm x 45° typical |
| 10.0 | -39.7 | 2.0 | 2.7 | -40.3 | 36.80 | ≤ 1 | 20 - 10 | SFS | none | ±1% | ≥ 85 | +0, -0.1mm | ±0.15mm | 546.1 | 0.2mm x 45° typical |
| 10.0 | -49.7 | 2.0 | 2.5 | -50.3 | 46.00 | ≤ 1 | 20 - 10 | SFS | none | ±1% | ≥ 85 | +0, -0.1mm | ±0.15mm | 546.1 | 0.2mm x 45° typical |
| 20.0 | -19.7 | 2.0 | 7.9 | -20.3 | 18.40 | ≤ 1 | 20 - 10 | SFS | none | ±1% | ≥ 85 | +0, -0.1mm | ±0.15mm | 546.1 | 0.2mm x 45° typical |
| 20.0 | -24.7 | 2.0 | 6.6 | -25.3 | 23.00 | ≤ 1 | 20 - 10 | SFS | none | ±1% | ≥ 85 | +0, -0.1mm | ±0.15mm | 546.1 | 0.2mm x 45° typical |
| 20.0 | -29.7 | 2.0 | 5.8 | -30.3 | 27.60 | ≤ 1 | 20 - 10 | SFS | none | ±1% | ≥ 85 | +0, -0.1mm | ±0.15mm | 546.1 | 0.2mm x 45° typical |