Crysmit have more than 10 years of experience in lens manufacturing, design, and optical precision assembly. We provide these lenses with the material of BK7, fused silica, sapphire, CaF2, and other glass raw material. Positive
Meniscus Lenses are a convex-concave lens, but is thicker at the center than at the edges. They are felt polished and are used universally in the ophthalmic industry where convention dictates that lens power be specified in Diopters.
Negative Meniscus Lenses are a convex-concave lens, but is thinner at the center than at the edges. Otherwise description is similar to Plano Concave lenses.
| Attribute | Specification |
| Material | N-BK7, Fused Silica, N-SF10, Silicon, CaF2, Sapphire, etc. |
| Typical Diameter (Фmm) | 10.0, 12.7, 15.0, 20.0, 25.4, 30.0, 50.8, etc. |
| Diameter Tolerance (mm) | +0.0/-0.02 (High Precision) |
| Paraxial Focal Length Tolerance (mm) | ±2% |
| Centration | <3 arc min |
| Clear Aperture | >90% |
| Surface Figure (@632.8nm) | λ/4 (High Precision) |
| IRR ( @632.8nm) | λ/10 (High Precision) |
| Surface Quality | 10/5 (High Precision) |
| Bevel (face width x 45°) | <0.25mm |
| Coating | uncoated, AR, HR, PR Coating, etc. |
