US 4,277,149 Example 7 — Minolta / Kunihiko Konoma
| 6 ELEMENTS / 5 GROUPS |
| f ≈ 45.0 mm |
| F/2.0 |
| 2ω ≈ 51.4° |
| ALL SPHERICAL |
Unit focus — entire optical assembly translates forward along the optical axis.
| Element | Type | Glass |
|---|---|---|
| L1 | Positive Meniscus | 781445 - lanthanum flint (catalog unresolved) |
| L2 | Positive Meniscus | 750501 - lanthanum crown (catalog unresolved) |
| L3 | Negative Meniscus | 701301 - dense flint (catalog unresolved) |
| L4 | Negative Meniscus | 640353 - medium flint (catalog unresolved) |
| L5 | Positive Meniscus | 755501 - lanthanum crown (catalog unresolved) |
| L6 | Biconvex Positive | 697555 - lanthanum crown (catalog unresolved) |
Detailed analysis available in the interactive viewer above.