WO 2019/229849 A1 — Keisuke Tsubonoya, Hiroki Harada, Toshinori Take
| 17 ELEMENTS / 10 GROUPS |
| f ≈ 59.6 mm |
| F/0.95 (design F/0.98) |
| 2ω ≈ 40.0° |
| 3 ASPHERICAL SURFACES |
Unit extension of entire front group GF (13 elements, surfaces 1A–22). GF translates 18.6 mm toward object for 0.5 m close focus. GR fixed. Manual focus only (~320° focus throw).
| Element | Type | Glass |
|---|---|---|
| L11 | Biconvex Positive (1× Asph) | 903358 class; J-LASFH9 catalog spectral proxy (production supplier unspecified) |
| L12 | Biconcave Negative | 553551 class; J-KZFH4 catalog spectral proxy (patent dPgF retained) |
| L13 | Biconcave Negative | KZFS-type (near N-KZFS4 / S-NBM51) |
| L14 | Biconvex Positive | ED phosphate crown (near S-FPM2 / FCD10; used ×3) |
| L21 | Biconvex Positive | J-LASFH22 (Hikari, patent nd/vd match) |
| L22 | Biconvex Positive | 593679 ED class; J-PSKH1 catalog spectral proxy (production supplier unspecified) |
| L23 | Biconvex Positive | 593679 ED class; J-PSKH1 catalog spectral proxy (production supplier unspecified) |
| L24 | Biconcave Negative | High-dispersion flint (near S-NBH53V; used ×2) |
| L25 | Biconcave Negative | 613445 class; J-KZFH1 catalog spectral proxy (patent dPgF retained) |
| L26 | Biconvex Positive | Super-ED fluorophosphate (near S-FPL51 / FCD1) |
| L27 | Biconvex Positive | S-LAH58 (OHARA); used ×3 |
| L28 | Biconvex Positive (1× Asph) | S-LAH98 (OHARA) / TAFD45 (HOYA) |
| L29 | Biconcave Negative | 738323 class; J-KZFH9 catalog spectral proxy (patent dPgF retained) |
| L31 | Biconvex Positive | S-LAH58 (OHARA; same as L27) |
| L32 | Biconcave Negative | E-FD15 (HOYA, patent nd/vd match) |
| L33 | Biconvex Positive | S-LAH58 (OHARA; same as L27) |
| L34 | Biconcave Negative (1× Asph) | Q-LASFPH2S (Hikari, patent nd/vd match) |