The definition of Menisus lens is a crescent shaped lens composed of two spherical surfaces with small curvature radii and little difference in numerical values.
The focal length of Menisus lens can be positive or negative.
Menisus lenses can correct color differences and are commonly used as correction lenses.
They can also serve as a spotlight for lighting systems, and selecting the appropriate thickness can also help eliminate color differences.
Common Specifications
| Material | Crown, Flint, UVFS | Focal Length Tolerance | ± 0.5% | ||||||||
| Diameter Tolerance | +0/-0.02mm | Thickness Tolerance | ±0.01mm | ||||||||
| Surface Flatness | λ/10 | Centration Error | <1 arcmin | ||||||||
| Surface Quality | 20/10 | Clear Aperture | >90% of central diameter | ||||||||
| Coating | MgF2 AR,BBAR or optional | Bevel | Protective bevel as needed | ||||||||
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