Design specs for 375 mm Fresnel Lens (Zone area = const.).
| Lens No. | Semi-dia. (mm) | Radius (mm) | Focal Length (mm) | Central Osculation (mm) | Zone Area (mm2) |
|---|---|---|---|---|---|
| 0th | 84.00 | 202.22 | 390.00 | 0.0 | 22067.1 |
| 1st | 118.80 | 208.16 | 401.43 | 168.0 | 22171.6 |
| 2nd | 145.50 | 213.95 | 412.61 | 237.6 | 22169.6 |
| 3rd | 168.00 | 219.62 | 423.55 | 291.0 | 22160.0 |
| 4th | 187.83 | 225.18 | 434.27 | 336.0 | 22167.4 |
| 5th | 205.00 | 230.39 | 444.32 | 375.7 | 21189.7 |