US 2017/0351051 A1 Example 1 — Fujifilm / Kawamura
| 10 elements / 6 groups |
| f = 22.377 mm design; 23 mm marketed |
| F2.06 design; F2 marketed |
| 2ω = 64.8° design |
| 4 aspherical surfaces on 2 elements |
| Single-element inner focus |
Inner focus by G2 only. The single negative L21 element moves imageward; G1 and G3 remain fixed. Close endpoint solves the patent prescription to the production 0.22 m MFD.
| Element | Type | Glass |
|---|---|---|
| L11 | Negative Meniscus | S-BSL7 (OHARA) |
| L12 | Biconvex Positive | S-LAH58 (OHARA) |
| L13 | Plano-Concave Negative | S-TIM28 (OHARA) |
| L14 | Biconcave Negative (2× Asph) | 849401 - high-index lanthanum flint (likely PGM aspheric melt; no exact public catalog match) |
| L15 | Plano-Convex Positive | S-LAH59 (OHARA) |
| L16 | Biconcave Negative | S-TIM28 (OHARA) |
| L17 | Biconvex Positive | S-LAH58 (OHARA) |
| L21 | Biconcave Negative (2× Asph) | 803405 - high-index lanthanum flint (likely PGM aspheric melt; no exact public catalog match) |
| L31 | Biconcave Negative | S-TIH23 (OHARA) |
| L32 | Biconvex Positive | S-LAH65V (OHARA) |
Detailed analysis available in the interactive viewer above.