US 2,645,973 Example 1 — Hiroshi Ito / Canon
| 7 ELEMENTS / 4 GROUPS |
| f ≈ 85.0 mm |
| F/1.5 |
| 2ω = 30° |
| ALL SPHERICAL |
Unit focusing — entire optical assembly moves forward.
| Element | Type | Glass |
|---|---|---|
| L1 | Positive Meniscus | SK10 (Schott) |
| L2 | Positive Meniscus | K-SK18 (Sumita) |
| L3 | Biconvex Positive | BK7 (Schott, ≈) |
| L4 | Biconcave Negative | S-TIM28 (OHARA) |
| L5 | Biconcave Negative | LLF6 (Schott, ≈) |
| L6 | Biconvex Positive | KzFS2 (Schott) |
| L7 | Biconvex Positive | K-SK18 (Sumita) |
Detailed analysis available in the interactive viewer above.