JP 2018-189733 A Example 1 — Sigma / Ryo Shioda
| 17 elements / 11 groups |
| 14.50-23.15 mm design |
| F2.93 design / F2.8 marketed |
| 21.63 mm image height |
| 5 aspherical surfaces / 3 aspherical elements |
Inner focusing by the G2 block toward the image side. Patent Example 1 publishes infinity zoom spacings only; close-focus travel is not numerically modeled.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus (1x Asph) | L-LAL13 (OHARA, low-Tg molded asphere glass) |
| L2 | Negative Meniscus | TAFD55-W / TAFD55 (HOYA, 001/291 high-index flint) |
| L3 | Negative Meniscus (2x Asph) | M-BACD5N (HOYA, 589613 moldable barium crown) |
| L4 | Negative Meniscus | FCD705 (HOYA, 550/755 low-dispersion glass) |
| L5 | Biconcave Negative | FCD100 (HOYA) / S-FPL53-class fluorophosphate |
| L6 | Biconvex Positive | TAFD37A (HOYA, 900/374 high-index lanthanum flint class) |
| L7 | Negative Meniscus | N-SF66 (SCHOTT) / E-FDS1-W (HOYA) class, 923/209 |
| L8 | Positive Meniscus | N-KZFS8 (Schott, 720347) |
| L9 | Biconvex Positive | S-NBH56 (OHARA, 855248) |
| L10 | Biconcave Negative | TAFD32 (HOYA) / high-index lanthanum class, 871/407 |
| L11 | Negative Meniscus | TAFD5G (HOYA) / S-LAH55V-class equivalent |
| L12 | Biconvex Positive | FCD100 (HOYA) / S-FPL53-class fluorophosphate |
| L13 | Negative Meniscus | TAFD30 (HOYA) / S-LAH58-class equivalent |
| L14 | Biconvex Positive | FCD100 (HOYA) / S-FPL53-class fluorophosphate |
| L15 | Negative Meniscus | TAFD30 (HOYA) / S-LAH58-class equivalent |
| L16 | Positive Meniscus | FCD1 (HOYA) / N-PK52A (SCHOTT) / S-FPL51-equivalent |
| L17 | Positive Meniscus (2x Asph) | M-FCD500 (HOYA, 553717) |
Detailed analysis available in the interactive viewer above.