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title: Catalog RFQ Simple Plano-Concave Lens
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# Plano-Concave Lens

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 |  |  |  |  |  |
| **Coating** | Uncoated, Specify your coating (*See [Coating Chart](https://www.rossoptical.com/capabilities/optical-coatings) for Available Options*) |  |  |  |  |  |
| **Design Wavelength** | 587.6nm |  |  |  |  |  |
| **Focal Length Tolerance** | ±2% |  |  |  |  |  |
| **Edge Thickness** | Reference |  |  |  |  |  |
| ** All dimensions are in mm* |  |  |  |  |  |  |