Bi-concave lenses have two inward curved surfaces. These lenses have a negative focal length. Our catalog bi-concave lenses have an identical curvature on both sides of the lens and are therefore symmetric. At unit conjugation, coma and distortion are cancelled out due to the symmetry. They are used to diverge incoming light or increase the focal length of an existing optical system.
| Diameter | Dia. Tolerance | CT Tolerance | Centering | Irregularity | Surface Quality | Bevel |
| 5.00-25.00 | +0.00 / -0.10 | ±0.1 | < 3 minutes | 0.5 Waves | 40-20 | 0.25 x 45° |
| 25.01 - 50.00 | +0.00 / -0.10 | ±0.1 | < 3 minutes | 0.5 Waves | 60-40 | 0.50 x 45° |
| 50.01-100.00 | +0.00 / -0.10 | ±0.1 | < 3 minutes | 0.5 Waves | 60-40 | 0.50 x 45° |
| Dimensions | MM | |||||
| Clear Aperture | CA >= 90% of Diameter | |||||
| Flat Annulus | Dia < 50 mm - Flat = 0.25 +0/-0.20 Dia > 50 mm - Flat = 0.50 +0/-0.40 |
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| Coating | Uncoated, Specify your coating (See Coating Chart for Available Options) | |||||
| Design Wavelength | 587.6nm | |||||
| Focal Length Tolerance | ±2% | |||||
| Edge Thickness | Reference | |||||
| * All dimensions are in mm | ||||||