CN 121454749 A Example 1 — Sigma / Shioda Ryo
| 17 elements / 11 groups |
| 4 SLD / 4 aspherical elements |
| f = 17.55–38.70 mm design |
| F1.86 design / F1.8 marketed |
| APS-C image height 14.20 mm |
| Internal zoom, G6 internal focus |
Internal focusing by G6 (L15). The patent publishes only infinity-focus zoom spacings; close-focus gaps are not reconstructed here.
| Element | Type | Glass |
|---|---|---|
| L1 | Neg. Meniscus (1× Asph) | MP-PCD51-70 (Hoya precision-mold preform; PCD51 class) |
| L2 | Neg. Meniscus (2× Asph) | MP-FCD500-20 (Hoya precision-mold ED preform) |
| L3 | Biconcave Negative | FC5 (Hoya) |
| L4 | Biconvex Positive | TAFD34 (Hoya) |
| L5 | Biconvex Positive | FCD705 (Hoya) |
| L6 | Negative Meniscus | NBFD29 (Hoya) |
| L7 | Negative Meniscus | FF8 (Hoya) |
| L8 | Biconvex Positive | TAC6L (Hoya) |
| L9 | Biconcave Negative | NBFD11 (Hoya) |
| L10 | Positive Meniscus | FDS16-W (Hoya) |
| L11 | Biconcave Negative | NBFD32 (Hoya) |
| L12 | Biconvex Positive | FCD505/FCD515 family (Hoya, 593/686 anomalous ED) |
| L13 | Biconvex Positive | FCD505/FCD515 family (Hoya, 593/686 anomalous ED) |
| L14 | Pos. Meniscus (2× Asph) | MP-PCD51-70 (Hoya precision-mold preform; PCD51 class) |
| L15 | Negative Meniscus | NBF1 (Hoya) |
| L16 | Biconvex Positive (1× Asph) | MP-NBFD130 (Hoya precision-mold preform) |
| L17 | Biconcave Negative | NBFD25 (Hoya) |
Detailed analysis available in the interactive viewer above.