US 3,591,257 Example 3 — Mandler / Edwards / Wagner
| 8 ELEMENTS / 6 GROUPS |
| f = 28 mm (e-line trace ≈ 29.2 mm) |
| F/2.8 |
| 2ω ≈ 74° |
| ALL SPHERICAL |
Unit focusing — entire optical assembly translates along the optical axis.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | SK16 (SCHOTT) |
| L2 | Negative Meniscus | SK16 (SCHOTT) |
| L3 | Biconvex Positive | LaF21 (SCHOTT) |
| L4 | Negative Meniscus | SF6 (SCHOTT) |
| L5 | Negative Meniscus | SK16 (SCHOTT) |
| L6 | Plano-Convex Positive | LaF10 (SCHOTT) |
| L7 | Negative Meniscus | SF6 (SCHOTT) |
| L8 | Negative Meniscus | F2 (SCHOTT) |
Detailed analysis available in the interactive viewer above.