US 4,908,639 A, Example 1 — Masaaki Yanagisawa
| 6 ELEMENTS / 6 GROUPS |
| 105 mm f/2 |
| PATENT EFL ≈ 104.944 mm; 2ω = 23° |
| NIKON FX AoV 23°20′; PRODUCT MFD 0.9 m |
| PUBLISHED MODEL FOCUS ENDPOINT 3.228 m |
| REAR FOCUS + DEFOCUS IMAGE CONTROL |
| ALL-SPHERICAL |
Published rear-focus model from corrected infinity to the patent 1:30 state (D0 3100.497 mm; 3.2280722 m object-to-image-plane). Nikon's production MFD is 0.9 m and is not internally reconstructed. Published DC under/over rows are exact at 1:30 with the Figure-3-inferred stop held at z = 36.0 mm; off-plane focus×DC combinations are disclosed constrained visualization states.
| Element | Type | Glass |
|---|---|---|
| L1 | Positive Meniscus | 670575 — J-LAK02 (HIKARI) coordinate-compatible spectral proxy; production supplier unresolved |
| L2 | Positive Meniscus | 694537 — H-LaK6A (CDGM) coordinate-compatible spectral proxy; production supplier unresolved |
| L3 | Negative Meniscus | 689311 — S-TIM28 (OHARA) coordinate-compatible spectral proxy; production supplier unresolved |
| L4 | Negative Meniscus | 717295 — supplier-neutral optical glass code |
| L5 | Positive Meniscus | 767468 — J-LASFH2 (HIKARI) coordinate-compatible spectral proxy; production supplier unresolved |
| L6 | Biconvex Positive | 797454 — J-LASF017 (HIKARI) coordinate-compatible spectral proxy; production supplier unresolved |