US 2025/0389929 A1 Example 2 — Canon / Saito
| Official: 15 elements / 11 groups; BR layer modeled separately |
| Patent Example 2: 16 optical members / 11 groups |
| f = 20.598 mm design, 20 mm marketed |
| F/1.46 design, f/1.4 marketed |
| 3 aspherical surfaces on 2 GMo elements |
| Inner focus L2; official MFD 0.20 m |
Inner focus by positive L2; patent tabulates 1.61 mm objectward travel from infinity to β=-0.1.
| Element | Type | Glass |
|---|---|---|
| G1 | Negative Meniscus | S-BSM14 (OHARA) |
| G2 | Neg. Meniscus (1× Asph) | J-SK12 (Hikari) |
| G3 | Negative Meniscus | S-FPL55 (OHARA) |
| G4 | Biconvex Positive | H-LaK53A (CDGM) |
| G5 | Negative Meniscus | S-NBH56 (OHARA) |
| G6 | Biconvex Positive | TAFD37A (Hoya) |
| G7 | Negative Meniscus | S-TIL2 (OHARA) |
| G8 | Biconvex Positive | TAFD40-W (Hoya) |
| G9 | Positive Meniscus | Unmatched (Canon BR organic; nd=1.57060, νd=20.1) |
| G10 | Biconcave Negative | H-ZBaF4 (CDGM, close match) |
| G11 | Positive Meniscus | J-FK01A (Hikari) |
| G12 | Negative Meniscus | NBFD29 (Hoya) |
| G13 | Biconvex Positive | J-FK01A (Hikari) |
| G14 | Biconvex Positive (2× Asph) | S-LAH65VS (OHARA) |
| G15 | Biconvex Positive | FCD515 (Hoya) |
| G16 | Biconcave Negative | H-ZBaF4 (CDGM, close match) |
Detailed analysis available in the interactive viewer above.