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Lens Size
| Lens Sizes | Polished Weight | Size In mm. |
| F000 | 0.00 - 0.03 | 1.0 mm |
| F0 | 0.06 - 0.40 cts. | 4.5 mm |
| F1 | 0.20 - 1.20 cts. | 7.0 mm |
| F2 | 0.30 - 1.55 cts. | 7.5 mm |
| F3 | 0.40 - 2.20 cts. | 8.5 mm |
| F4 | 0.45 - 3.00 cts. | 9.5 mm |
| F5 | 0.70 - 4.90 cts. | 11.0 mm |
| F7 | 1.50 - 6.50 cts. | 13.0 mm |
| F15 | 4.80 - 15.0 cts. | 16.5 mm |
| F40 | 14.50 - 40.0 cts. | 25.0 mm |
| F100 | 25.00 - 100 cts. | 32.0 mm |
| F500 | 50.00 - 500 cts. | 57.00 mm |
| S4 | 0.50 - 5.00 cts. | 11.0 mm |
| S15 | 4.90 - 15.0 cts. | 16.5 mm |
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