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The 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.
Specifications of Mensiscus Lens:
| Material: | BK7 |
| Design Wavelength: | 546.1nm, n=1.518721 |
| Diameter Tolerance: | +0.0/-0.1mm |
| Paraxial Focal Length: | ±2% |
| Centration: | 3 arc minutes |
| Surface Figure : | l/4 @ 633 nm |
| Surface Quality: | 60/40 |
| Clear Aperture: | >80% |
| Bevel: | <0.25mm X 45° |
| Coating: | Uncoated |
| Item# | F(mm) | f(mm) | R1 | R2 | Tc | Te | Fb |
| MNP1-201 | 25.4 | 100.0 | 33.42 | 89.95 | 4.0 | 2.39 | 96.01 |
| MNP1-202 | 25.4 | 150.0 | 42.36 | 89.95 | 4.0 | 2.95 | 145.20 |
| MNP1-203 | 25.4 | 200.0 | 48.75 | 89.95 | 3.5 | 2.72 | 194.51 |
| MNP1-204 | 25.4 | 250.0 | 83.95 | 235.5 | 3.5 | 2.88 | 245.97 |
| MNP1-205 | 25.4 | 300.0 | 94.19 | 235.5 | 3.5 | 2.98 | 296.27 |
| MNP1-206 | 25.4 | 400.0 | 110.92 | 235.5 | 3.5 | 3.11 | 396.06 |
| MNP1-207 | 25.4 | 500.0 | 124.17 | 235.5 | 3.5 | 3.19 | 496.16 |
| MNP1-208 | 25.4 | 1000.0 | 278.34 | 600.00 | 3.5 | 3.30 | 993.7 |
