JP1974-023892 — Masamichi Kitagawa
| 9 ELEMENTS / 5 GROUPS |
| 300mm f/6.3 (MARKETED) |
| EFL 299.705 mm (TRACED) |
| 8.25° FULL FIELD (PATENT) |
| ALL SPHERICAL |
NO_INTERNAL_RECONSTRUCTION: the patent publishes the infinity prescription only; the 4.5 m manufacturer MFD is metadata and no focus motion is modeled.
| Element | Type | Glass |
|---|---|---|
| L1 | Positive Meniscus | Fluorite (CaF₂ crystal; supplier unspecified) |
| L2 | Positive Meniscus | Fluorite (CaF₂ crystal; supplier unspecified) |
| L3 | Negative Meniscus | 804396 class; S-LAH63Q catalog-equivalent coefficient proxy (production supplier unspecified) |
| L4 | Biconvex Positive | 511509 class; KF8 catalog-equivalent coefficient proxy (production supplier unspecified) |
| L5 | Biconcave Negative | 498650 class; BSL3 catalog-equivalent coefficient proxy (production supplier unspecified) |
| L6 | Biconcave Negative | 787501 class; YGH52 catalog-equivalent coefficient proxy (production supplier unspecified) |
| L7 | Biconvex Positive | 593354 class; FF5 catalog-equivalent coefficient proxy (production supplier unspecified) |
| L8 | Biconvex Positive | 593354 class; FF5 catalog-equivalent coefficient proxy (production supplier unspecified) |
| L9 | Negative Meniscus | 816445 class; TAFD10 catalog-equivalent coefficient proxy (production supplier unspecified) |