WO 2020/213337 A1 — Kota Omiya, Tetsuichiro Okumura
| 14 ELEMENTS / 12 GROUPS |
| 20 mm (scaled from 19.5069 mm paraxial) |
| f/1.8 marketed / f/1.85 patent |
| 94° FULL-FRAME FIELD |
| 4 ASPHERICAL SURFACES / 2 ELEMENTS |
| 3 ED-CLASS ELEMENTS |
Inner focus: GR2 translates 5.536 mm objectward from the patent infinity to close-focus state.
| Element | Type | Glass |
|---|---|---|
| L11 | Negative Meniscus | S-LAL18 (OHARA) |
| L12 | Negative Meniscus (ED) | FCD705 (HOYA) |
| L13 | Neg. Meniscus (2× Asph) | M-BACD12 (HOYA) |
| L14 | Positive Meniscus | S-NPH5 (OHARA) |
| L15 | Negative Meniscus | S-TIH13 (OHARA) |
| L16 | Biconvex Positive | S-LAH58 (OHARA) |
| L21 | Biconvex Positive (ED) | ED fluorophosphate 497/816 class (FCD1 / S-FPL51 / J-FK01A; vendor undetermined) |
| L22 | Negative Meniscus | S-TIH4 (OHARA) |
| L23 | Biconvex Positive (ED) | ED fluorophosphate 497/816 class (FCD1 / S-FPL51 / J-FK01A; vendor undetermined) |
| L24 | Biconcave Negative | S-NBH56 (OHARA) |
| L25 | Biconvex Positive | FDS18 (HOYA) |
| L26 | Biconcave Negative | S-NBH56 (OHARA) |
| L27 | Biconcave Negative (2× Asph) | M-TAFD305 (HOYA) |
| L31 | Biconvex Positive | BSC7 (HOYA) |