CN 216772097 U — Yidan Zheng, Hanzhao Chen, Xiaoqing Zhan
| 11 ELEMENTS / 9 GROUPS |
| f ≈ 33.8 mm |
| F/1.8 |
| 2ω ≈ 63° |
| 3 ASPHERICAL ELEMENTS (6 SURFACES) |
Inner focus — single negative element (L21, Group G2) driven by linear motor. Total travel 6.92 mm; overall optical length is constant.
| Element | Type | Glass |
|---|---|---|
| L11 | Positive Meniscus | FDS18 (HOYA, 946180) |
| L12 | Negative Meniscus | S-FPL51 (OHARA) / FCD1 class (ED fluorophosphate, νd = 81.6) |
| L13 | Negative Meniscus | S-TIM28 (OHARA) |
| L14 | Positive Meniscus | S-FPL51 (OHARA) / FCD1 class (ED fluorophosphate, νd = 81.6) |
| L15 | Biconvex Positive | S-LAL18 (OHARA) |
| L16 | Biconvex Positive | FCD515 (Hoya) |
| L17 | Negative Meniscus | NBFD15 (HOYA) |
| L18 | Pos. Meniscus (2× Asph) | C2 (Hoya catalog equivalent; patent code 516565, supplier unspecified) |
| L21 | Neg. Meniscus (2× Asph) | C2 (Hoya catalog equivalent; patent code 516565, supplier unspecified) |
| L31 | Biconvex Positive (2× Asph) | C2 (Hoya catalog equivalent; patent code 516565, supplier unspecified) |
| L32 | Negative Meniscus | H-K9L (CDGM) / N-BK7 (Schott) class, code 517/642 |