These lenses have one flat surface and one concave surface. They have a negative focal length and are used to diverge incoming light, or to increase focal length in an existing optical system. They can be used in beam expanders and projection systems.
| 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 | ||||||