Positive meniscus lenses may be used to increase the numerical aperture of apositive lens assembly, without an undue increase in the aberrations.
| Material: | BK7, Fused Silica, SF10, CaF2, Sapphire .etc. |
| Paraxial Focal Length Tolerance: | ±2% |
| Dimension Tolerance: | ±0.2(General). ±0.05(High Precision) |
| Centration: | <3 arc min |
| IRR: | λ/4@633nm（General),λ/10@633nm(High Precision) |
| Clear Aperture: | >80%(Small Size), >95%(Laege Size) |
| Surface Figure | <1.5λ@633nm（General),<λ/4@633nm(High Precision) |
| Surface Quality: | 60/40（General),10/5(High Precision) |
| Bevel: | <0.25mm |
| Coating: | Uncaoted, AR,PR, HR, etc. |
| Item# | F(mm) | f(mm) | R1 | R2 | Tc | Te | Fb |
| Material | N-BK7 | ||||||
| PML-201 | 25.4 | 100 | 33.42 | 89.95 | 4 | 2.39 | 96.01 |
| PML-202 | 25.4 | 150 | 42.36 | 89.95 | 4 | 2.95 | 145.2 |
| PML-203 | 25.4 | 200 | 48.75 | 89.95 | 3.5 | 2.72 | 194.51 |
| PML-204 | 25.4 | 250 | 83.95 | 235.5 | 3.5 | 2.88 | 245.97 |
| PML-205 | 25.4 | 300 | 94.19 | 235.5 | 3.5 | 2.98 | 296.27 |
| PML-206 | 25.4 | 400 | 110.92 | 235.5 | 3.5 | 3.11 | 396.06 |
| PML-207 | 25.4 | 500 | 124.17 | 235.5 | 3.5 | 3.19 | 496.16 |
| PML-208 | 25.4 | 1000 | 278.34 | 600 | 3.5 | 3.3 | 993.7 |