WO 2022/097401 A1 — Tomonori Kuribayashi
| 16 ELEMENTS / 11 GROUPS |
| f ≈ 102.9 mm |
| F/2.89 |
| 2ω ≈ 24.1° |
| 1 ASPHERICAL SURFACE |
Dual inner focus — G2 moves image-ward (+19.0 mm), G3 moves object-ward (+20.7 mm). G1, aperture stop, and G4 are fixed. Constant overall length.
| Element | Type | Glass |
|---|---|---|
| L11 | Biconvex Positive | S-LAH55V (OHARA) |
| L12 | Negative Meniscus | NBFD25 (HOYA, 855252) |
| L13 | Positive Meniscus | J-PSKH1 (Hikari, patent nd/vd match) |
| L14 | Positive Meniscus | J-PSKH1 (Hikari, patent nd/vd match) |
| L21 | Biconcave Negative | Phosphate crown (glass code 519699) |
| L22 | Negative Meniscus | Lanthanum/titanium flint (glass code 720347) |
| L23 | Positive Meniscus | FDS18 (HOYA catalog-equivalent; patent vendor unspecified) |
| L31 | Biconvex Positive | S-LAH55V (OHARA) |
| L32 | Negative Meniscus | NBFD25 (HOYA, 855252) |
| L33 | Biconvex Positive | J-PSKH1 (Hikari, patent nd/vd match) |
| L41 | Negative Meniscus | S-LAH98 (OHARA, patent nd/vd match) |
| L42 | Negative Meniscus | Phosphate crown (glass code 519699) |
| L43 | Positive Meniscus | FDS18 (HOYA catalog-equivalent; patent vendor unspecified) |
| L44 | Negative Meniscus | Ultra-high-index specialty (glass code 001255, nd > 2.0) |
| L45 | Positive Meniscus | S-LAH63 (OHARA) |
| L46 | Neg. Meniscus (1× Asph) | N-BK7 (Schott) / S-BSL7 (OHARA) |