JP 3909533 B2 — Haruo Sato
| 6 ELEMENTS / 6 GROUPS |
| DESIGN f = 30.88–58.55 mm |
| DESIGN F/4.09–5.85 |
| ALL SPHERICAL |
| E4/E5 THICKNESSES FROM NIKON'S TALE 83 |
The front group G1 alone moves toward the object to focus (patent ¶0050), about 4.7–4.8 mm from infinity to 0.35 m. The patent prints no near-focus spacings; d4 is solved paraxially for Nikon's 0.35 m minimum focus distance, taken as object-to-image distance, and interpolated between keyframes.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | Q-LASFPH3S (coordinate-compatible spectral proxy; supplier and melt unconfirmed) |
| L2 | Positive Meniscus | S-TIH53 (coordinate-compatible spectral proxy; supplier and melt unconfirmed) |
| L3 | Biconvex Positive | N-SSK5 (coordinate-compatible spectral proxy; supplier and melt unconfirmed) |
| L4 | Biconvex Positive | N-SSK5 (coordinate-compatible spectral proxy; supplier and melt unconfirmed) |
| L5 | Biconcave Negative | S-TIH6 (coordinate-compatible spectral proxy; supplier and melt unconfirmed) |
| L6 | Positive Meniscus | E-FD15 (coordinate-compatible spectral proxy; supplier and melt unconfirmed) |