BK-7 Plano Concave Lenses
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Simple general use negative lenses
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Focal lengths from -15 to -200mm
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Diameters from 10.0 to 50.8mm
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Optional Anti-Reflection coatings available
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For additional sizes see Micro Optics
These simple negative lenses have many uses. Alone they form a virtual image of a distant object or collimated light source. Used in combination with other optics they reduce the power of the system. Sharp edges, which are common in negative lenses, are removed by beveling in order 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 upon request.
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| Number | |
|---|---|
| 015-0040 | |
| 015-0040-A55 | |
| 015-0041 | |
| 015-0041-A55 | |
| 015-0042 | |
| 015-0042-A55 | |
| 015-0043 | |
| 015-0043-A55 | |
| 015-0044 | |
| 015-0044-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 | -15.0 | 2.0 | 3.8 | -16.3 | 7.79 | ≤ 1 | 20 - 10 | BK7 | none | ±1% | ≥ 90 | +0, -0.1mm | ±0.15mm | 546.1 | 0.2mm x 45° typical |
| 10.0 | -15.0 | 2.0 | 3.8 | -16.3 | 7.79 | ≤ 1 | 20 - 10 | BK7 | BMAR 425-675nm | ±1% | ≥ 90 | +0, -0.1mm | ±0.15mm | 546.1 | 0.2mm x 45° typical |
| 10.0 | -60.0 | 2.0 | 2.4 | -61.3 | 31.14 | ≤ 1 | 20 - 10 | BK7 | none | ±1% | ≥ 90 | +0, -0.1mm | ±0.15mm | 546.1 | 0.2mm x 45° typical |
| 10.0 | -60.0 | 2.0 | 2.4 | -61.3 | 31.14 | ≤ 1 | 20 - 10 | BK7 | BMAR 425-675nm | ±1% | ≥ 90 | +0, -0.1mm | ±0.15mm | 546.1 | 0.2mm x 45° typical |
| 10.0 | -70.0 | 2.0 | 2.3 | -71.3 | 36.33 | ≤ 1 | 20 - 10 | BK7 | none | ±1% | ≥ 90 | +0, -0.1mm | ±0.15mm | 546.1 | 0.2mm x 45° typical |
| 10.0 | -70.0 | 2.0 | 2.3 | -71.3 | 36.33 | ≤ 1 | 20 - 10 | BK7 | BMAR 425-675nm | ±1% | ≥ 90 | +0, -0.1mm | ±0.15mm | 546.1 | 0.2mm x 45° typical |
| 10.0 | -80.0 | 2.0 | 2.3 | -81.3 | 41.52 | ≤ 1 | 20 - 10 | BK7 | none | ±1% | ≥ 90 | +0, -0.1mm | ±0.15mm | 546.1 | 0.2mm x 45° typical |
| 10.0 | -80.0 | 2.0 | 2.3 | -81.3 | 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 | -90.0 | 2.0 | 2.3 | -91.3 | 46.71 | ≤ 1 | 20 - 10 | BK7 | none | ±1% | ≥ 90 | +0, -0.1mm | ±0.15mm | 546.1 | 0.2mm x 45° typical |
| 10.0 | -90.0 | 2.0 | 2.3 | -91.3 | 46.71 | ≤ 1 | 20 - 10 | BK7 | BMAR 425-675nm | ±1% | ≥ 90 | +0, -0.1mm | ±0.15mm | 546.1 | 0.2mm x 45° typical |