CN205720849U Example 2 — Anhui Changgeng Optical Technology / Zhang Xiaohua
| 16 elements / 10 groups |
| Design f = 12.4999 mm |
| Design Fno = 2.87 |
| 2ω = 120.2° |
| 4 aspherical surfaces / 2 aspherical elements |
| 3 ED-class elements |
Floating focus: G1 fixed; G2 and G3 move. The patent variable-gaps encode infinity and a beta=0.02x finite-focus check, not the production 0.2x minimum-focus endpoint.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | 749547 - high-index crown class (patent nd=1.74916, vd=54.67; unresolved) |
| L2 | Neg. Meniscus (2× Asph) | BACD12 / S-BAL42 class (583/595) |
| L3 | Negative Meniscus | FCD1 / H-FK61 / S-FPL51 class (497/816 ED) |
| L4 | Plano-Convex Positive | E-F1 class (HOYA, 626/357) |
| L5 | Biconcave Negative | 835447 - high-index lanthanum class (patent nd=1.83481, vd=44.72; unresolved) |
| L6 | Biconvex Positive | FD140 class (HOYA, 762/266) |
| L7 | Negative Meniscus | N-SF66 (SCHOTT) / E-FDS1 class (923/209) |
| L8 | Biconvex Positive | E-F3 class (HOYA, 613/370) |
| L9 | Biconcave Negative | TAFD35L / TAFD35 class (HOYA, 911/353) |
| L10 | Biconvex Positive | E-F2 class (HOYA, 620/363) |
| L11 | Positive Meniscus | FD110 class (HOYA, 785/257) |
| L12 | Negative Meniscus | 904293 - dense flint class (patent nd=1.90366, vd=29.31; unresolved) |
| L13 | Biconvex Positive | FCD1 / H-FK61 / S-FPL51 class (497/816 ED) |
| L14 | Negative Meniscus | TAFD35L / TAFD35 class (HOYA, 911/353) |
| L15 | Biconvex Positive | FCD1 / H-FK61 / S-FPL51 class (497/816 ED) |
| L16 | Neg. Meniscus (2× Asph) | D-ZLAF81-25 (CDGM) |
Detailed analysis available in the interactive viewer above.