JP 2022-100641 A — Yoshihisa Yomogida, Yuki Shibata
| 10 ELEMENTS / 7 GROUPS |
| f = 28.50 mm |
| F/2.0 |
| 2ω = 75.4° |
| 2 ASPHERICAL SURFACES (1 ELEMENT) |
Source near station: ZD0=430 mm plus LT=60.2274 mm and 1.93 mm extension gives 49.22 cm. All lenses and stop move together. The rounded prescription instead computes about 50.98 cm; this source discrepancy remains unresolved.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | BSC7 (HOYA) / N-BK7 (Schott) (inferred coordinate counterpart) |
| L2 | Plano-Concave | E-FD2 (HOYA, patent nd/vd match) / SF2 (Schott) (inferred coordinate counterpart) |
| L3 | Plano-Convex | TAFD35 (HOYA, patent nd/vd match) (inferred coordinate counterpart) |
| L4 | Biconvex Positive | TAFD35 (HOYA, patent nd/vd match) (inferred coordinate counterpart) |
| L5 | Biconcave Negative | S-TIH14 (OHARA, patent nd/vd match) (inferred coordinate counterpart) |
| L6 | Biconcave Negative | S-TIH1 (OHARA) / SF1 (Schott) (inferred coordinate counterpart) |
| L7 | Biconvex Positive | S-LAC14 (OHARA) / N-LaK14 (Schott) (inferred coordinate counterpart) |
| L8 | Biconvex Positive | H-ZLAF68C (CDGM, patent nd/vd match) (inferred coordinate counterpart) |
| L9 | Negative Meniscus | J-PSKH8 catalog equivalent (patent 630581; production supplier unspecified) (inferred coordinate counterpart) |
| L10 | Neg. Meniscus (2× Asph) | NBFD3 (HOYA) / S-LAH63Q (OHARA) (inferred coordinate counterpart) |