These lenses consist of two optical elements, usually of crown and flint glass types, cemented together to form an achromatic doublet. Most often, the crown lens is a biconvex positive lens. Due to the difference in refractive indices, chromatic aberration with respect to two selected wavelengths has been corrected. The lenses have been corrected for on-axis spherical aberration as well. Achromatic doublets are used as telescope objectives, eye loupes, magnifying glasses and eyepieces. Achromatic doublets have also been used to focus and manipulate laser beams because their image quality is superior to single lenses.
| Ross Optical Industries | |
|---|---|
| Product Category | Optical Lenses |
| Product Number | L-AOC005 |
| Product Name | Standard Achromats |
| Lens Type | Achromats; Spherical Lens |
| Lens Application | Infrared (optional feature); Visible; Ultraviolet (optional feature) |
| Focal Length | 20 mm (0.7874 inch) |
| Center Thickness | 3.9 mm (0.1535 inch) |
| Edge Thickness | 2.8 mm (0.1102 inch) |
