BK-7 Biconcave Lenses
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Symmetrically concave negative lenses
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Focal lengths from -9.7 to -299.5mm
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Diameters from 10.0 to 50.8mm
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Complete range of optional Anti-Reflection coatings available
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For additional sizes see Micro Optics
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.
BK7 lenses are offered uncoated or with our A55 broadband visible (425-675nm) Anti-Reflection coating. In addition, a wide range of standard Anti-Reflection coatings for other wavelengths are available for these lenses.
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| Number | |
|---|---|
| 017-0050 | |
| 017-0050-A55 | |
| 017-0060 | |
| 017-0060-A55 | |
| 017-0070 | |
| 017-0070-A55 | |
| 017-0077 | |
| 017-0077-A55 | |
| 017-0078 | |
| 017-0078-A55 |
| 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 | 4.6 | -10.3 | 10.38 | ≤ 1 | 20 - 10 | BK7 | none | ±1% | ≥ 90 | +0, -0.1mm | ±0.15mm | 546.1 | 0.2mm x 45° typical |
| 10.0 | -9.7 | 2.0 | 4.6 | -10.3 | 10.38 | ≤ 1 | 20 - 10 | BK7 | BMAR 425-675nm | ±1% | ≥ 90 | +0, -0.1mm | ±0.15mm | 546.1 | 0.2mm x 45° typical |
| 10.0 | -14.7 | 2.0 | 3.6 | -15.3 | 15.57 | ≤ 1 | 20 - 10 | BK7 | none | ±1% | ≥ 90 | +0, -0.1mm | ±0.15mm | 546.1 | 0.2mm x 45° typical |
| 10.0 | -14.7 | 2.0 | 3.6 | -15.3 | 15.57 | ≤ 1 | 20 - 10 | BK7 | BMAR 425-675nm | ±1% | ≥ 90 | +0, -0.1mm | ±0.15mm | 546.1 | 0.2mm x 45° typical |
| 10.0 | -19.7 | 2.0 | 3.2 | -20.3 | 20.76 | ≤ 1 | 20 - 10 | BK7 | none | ±1% | ≥ 90 | +0, -0.1mm | ±0.15mm | 546.1 | 0.2mm x 45° typical |
| 10.0 | -19.7 | 2.0 | 3.2 | -20.3 | 20.76 | ≤ 1 | 20 - 10 | BK7 | BMAR 425-675nm | ±1% | ≥ 90 | +0, -0.1mm | ±0.15mm | 546.1 | 0.2mm x 45° typical |
| 10.0 | -39.7 | 2.0 | 2.6 | -40.3 | 41.52 | ≤ 1 | 20 - 10 | BK7 | none | ±1% | ≥ 90 | +0, -0.1mm | ±0.15mm | 546.1 | 0.2mm x 45° typical |
| 10.0 | -39.7 | 2.0 | 2.6 | -40.3 | 41.52 | ≤ 1 | 20 - 10 | BK7 | BMAR 425-675nm | ±1% | ≥ 90 | +0, -0.1mm | ±0.15mm | 546.1 | 0.2mm x 45° typical |
| 10.0 | -49.7 | 2.0 | 2.5 | -50.3 | 51.90 | ≤ 1 | 20 - 10 | BK7 | none | ±1% | ≥ 90 | +0, -0.1mm | ±0.15mm | 546.1 | 0.2mm x 45° typical |
| 10.0 | -49.7 | 2.0 | 2.5 | -50.3 | 51.90 | ≤ 1 | 20 - 10 | BK7 | BMAR 425-675nm | ±1% | ≥ 90 | +0, -0.1mm | ±0.15mm | 546.1 | 0.2mm x 45° typical |