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Plano-concave lenses diverge parallel light outward. They have negative focal lengths and negative spherical aberrations, and can be used to correct phase and spherical aberrations.
| Specification | Value |
|---|---|
| Plano concave lenses | Plano concave lenses |
| Material | K 9, optical glass, UV quartz, fluorine |
| Focal length (f') | ±2%@587.6nm |
| Dimensional tolerances | -0.05~0.1mm |
| Center thickness tolerance | ±0.03~0.1mm |
| Centering (arcmin) | 30"~3' |
| Power | 1~5 |
| Irregularity | 0.2~0.5 |
| Surface quality | 60-40 40-20 |
| Clear aperture | >90% |
| Coating | AR coating |
| Diameter (mm) | Focal Length (mm) | Back Focal Length (mm) | Center Thickness (mm) | Edge Thickness (mm) | Radius of Curvature (mm) |
|---|---|---|---|---|---|
| 9.0 | -27.0 | -28.3 | 2.0 | 2.7 | -13.9 |
| 12.7 | -25.0 | -27.0 | 3.0 | 4.7 | -12.9 |
| 12.7 | -30.0 | -32.0 | 3.0 | 4.4 | -15.4 |
| 12.7 | -50.0 | -52.3 | 3.5 | 4.3 | -25.7 |
| 25.0 | -75.0 | -77.3 | 3.5 | 5.6 | -38.6 |
| 25.4 | -50.0 | -52.3 | 3.5 | 6.9 | -25.7 |
| 25.4 | -75.0 | -77.3 | 3.5 | 5.6 | -38.6 |
| 25.4 | -100.0 | -102.6 | 4.0 | 5.6 | -51.5 |
| 50.8 | -100.0 | -102.6 | 4.0 | 10.7 | -51.5 |
| 25.0 | -150.0 | -125.6 | 4.0 | 8.3 | -77.2 |
