US 4,396,256 A — Daijiro Fujie
| 7 ELEMENTS / 5 GROUPS |
| f ≈ 85.0 mm |
| F/1.4 |
| 2ω ≈ 28.5° |
| ALL SPHERICAL |
Floating focus direction follows the patent: L1–L4 and the stop move farther objectward than L5, enlarging D10. The 2 mm differential and 0.85 m endpoint are assumed; rear extension is reconstructed to match that endpoint. No finite station is published.
| Element | Type | Glass |
|---|---|---|
| L1 | Positive Meniscus | N-LAF34 (Schott, inferred coordinate counterpart) |
| L2 | Positive Meniscus | N-LAK14 (Schott, inferred coordinate counterpart) |
| L3a | Biconvex Positive | SF11 (Schott, inferred coordinate counterpart) |
| L3b | Biconcave Negative | E-FD4 (HOYA, inferred coordinate counterpart) |
| L4a | Biconcave Negative | E-FL5 (HOYA, inferred coordinate counterpart) |
| L4b | Biconvex Positive | NBF1 (HOYA, inferred coordinate counterpart) |
| L5 | Biconvex Positive | NBF1 (HOYA, inferred coordinate counterpart) |