WO 2022/071249 A1 — Toshiyuki Shimada
| 9 ELEMENTS / 8 GROUPS |
| f ≈ 28.8 mm |
| F/2.8 |
| 2ω ≈ 76.1° |
| 3 ASPHERICAL SURFACES |
Floating inner-focus: G2 (GF1) and G3 (GF2) move toward the object with differential travel (1.68 mm and 4.79 mm respectively). G1, aperture stop, and G4 remain fixed.
| Element | Type | Glass |
|---|---|---|
| L11 | Biconcave Negative | 532488 class; J-LLF6 catalog spectral proxy (production supplier unspecified) |
| L12 | Plano-Convex Positive | S-LAH65V (OHARA) |
| L21 | Biconvex Positive | S-LAH99 (OHARA, patent nd/vd match) |
| L22 | Biconcave Negative | S-TIH6 (OHARA, patent nd/vd match) |
| L23 | Negative Meniscus | 808227 class; J-SFH1 catalog spectral proxy (production supplier unspecified) |
| L24g | Plano-Convex Positive | S-LAH65V (OHARA) |
| L24r | Pos. Meniscus (1× Asph) | UV-curing resin (proprietary) |
| L31 | Neg. Meniscus (2× Asph) | S-BAL 41 (OHARA) |
| L32 | Plano-Convex Positive | S-LAH65V (OHARA) |
| L41 | Biconcave Negative | S-TIM22 (OHARA) |