US 3,649,104 EXAMPLE 3 — ERNST LEITZ / EDWARDS, MANDLER, WAGNER
| 4 ELEMENTS / 4 GROUPS |
| f ≈ 50.0 mm |
| F/2.0 |
| 2ω = 45° |
| ALL SPHERICAL |
Unit focusing — entire optical assembly translates as a rigid unit.
| Element | Type | Glass |
|---|---|---|
| L1 | Positive Meniscus | LaK9 (Schott / Leitz) |
| L2 | Positive Meniscus | ≈BaF10 (Leitz proprietary) |
| L3 | Negative Meniscus | ≈SF4 (dense flint) |
| L4 | Biconvex Positive | ≈LAFN7 (lanthanum flint) |
Detailed analysis available in the interactive viewer above.