US 2014/0354857 A1 — Takuya Kato, Atsushi Oohata, Hiroki Hagiwara
| 14 ELEMENTS / 11 GROUPS |
| f = 9.19-64.68 mm (DESIGN) |
| F/2.91 (DESIGN) |
| 2ω = 81.98°-12.93° |
| 13 ASPHERICAL SURFACES / 7 ELEMENTS |
Inner focus: the fourth group, the single biconcave element L12, translates along the axis; all other groups are stationary during focus. The patent publishes no close-focus spacing states, so no internal focus travel is modelled.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | FDS90 — coordinate-compatible spectral proxy; production supplier unconfirmed |
| L2 | Positive Meniscus | FCD1 — coordinate-compatible spectral proxy; production supplier unconfirmed |
| L3 | Positive Meniscus | J-PSKH4 — coordinate-compatible spectral proxy; production supplier unconfirmed |
| L4 | Neg. Meniscus (2x Asph) | 803456 - high-index lanthanum class (catalog unresolved) |
| L5 | Biconcave Negative | S-LAL18 — coordinate-compatible spectral proxy; production supplier unconfirmed |
| L6 | Biconvex Positive | TAFD40 — coordinate-compatible spectral proxy; production supplier unconfirmed |
| L7 | Neg. Meniscus (2x Asph) | NBFD10 — coordinate-compatible spectral proxy; production supplier unconfirmed |
| L8 | Biconvex Pos. (2x Asph) | M-PCD51 — coordinate-compatible spectral proxy; production supplier unconfirmed |
| L9 | Biconvex Positive | FC5 — coordinate-compatible spectral proxy; production supplier unconfirmed |
| L10 | Biconcave Negative | NBFD15 — coordinate-compatible spectral proxy; production supplier unconfirmed |
| L11 | Biconvex Pos. (2x Asph) | S-BAL35 — coordinate-compatible spectral proxy; production supplier unconfirmed |
| L12 | Biconcave Neg. (2x Asph) | M-TAF101 — coordinate-compatible spectral proxy; production supplier unconfirmed; nd follows the documented patent correction |
| L13 | Biconvex Pos. (2x Asph) | M-PCD51 — coordinate-compatible spectral proxy; production supplier unconfirmed |
| L14 | Biconcave Neg. (1x Asph) | M-PCD4 — coordinate-compatible spectral proxy; production supplier unconfirmed |