US 4,812,027 A, Embodiment 1 — Masaaki Yanagisawa
| 6 ELEMENTS / 6 GROUPS |
| 85 mm |
| F/1.8 |
| 2ω = 28° |
| REAR FOCUS |
Published rear focus: L4-L6 translate 12.6617 mm objectward as a rigid group. The inferred fixed stop splits patent d6, so STO-to-L4 changes 18.2330→5.5713 mm while BF changes 38.2080→50.8697 mm; the fixed image plane is preserved and the computed close conjugate is 0.849892 m from the image plane.
| Element | Type | Glass |
|---|---|---|
| L1 | Positive Meniscus | 767468 — J-LASFH2 (HIKARI) coordinate-compatible spectral proxy; production supplier unresolved |
| L2 | Positive Meniscus | 720503 — J-LAK10 (HIKARI) coordinate-compatible spectral proxy; production supplier unresolved |
| L3 | Negative Meniscus | 785261 — SF56A (SCHOTT) coordinate-compatible spectral proxy; production supplier unresolved |
| L4 | Negative Meniscus | 626356 — F1 (SUMITA) coordinate-compatible spectral proxy; production supplier unresolved |
| L5 | Positive Meniscus | 694538 — H-LaK6A (CDGM) coordinate-compatible spectral proxy; production supplier unresolved |
| L6 | Biconvex Positive | 767468 — J-LASFH2 (HIKARI) coordinate-compatible spectral proxy; production supplier unresolved |