Negative Achromats consist of two optical components, a crown and a flint glass lens, cemented together. The crown is usually a bi-concave lens. As is true to all Achromats, they are corrected for color and on-axis spherical aberration. They are used predominantly to extend focal lengths in combination with positive achromatic systems or CCD lenses.
| Ross Optical Industries | |
|---|---|
| Product Category | Optical Lenses |
| Product Number | L-AON004 |
| Product Name | Negative Achromats |
| Lens Type | Achromats; Spherical Lens |
| Lens Application | Infrared (optional feature); Visible; Ultraviolet (optional feature) |
| Focal Length | -20 mm (-0.7874 inch) |
| Center Thickness | 3.5 mm (0.1378 inch) |
| Edge Thickness | 4.95 mm (0.1949 inch) |
