CN 211955963 U, Example 1 — Liu Ruijun, Chen Baofeng
| 10 ELEMENTS / 8 GROUPS |
| 35 mm MARKETED / 34.545 mm PATENT EFL |
| f/1.8 |
| 63.2° FULL-FRAME VIEW |
| 2 ASPHERICAL ELEMENTS / 4 ASPHERICAL SURFACES |
| PATENT 0.3 m FOCUS ROW / PRODUCTION MFD 0.4 m |
PUBLISHED patent focus: L31/G3 alone translates 4.92 mm imageward; D1 1.00→5.92 mm and D2 8.69→3.77 mm, with D1+D2=9.69 mm. The 0.3 m endpoint is the patent row; the production Viltrox lens is marketed at 0.4 m MFD.
| Element | Type | Glass |
|---|---|---|
| L11 | Negative Meniscus | N-FK5 (catalog-equivalent spectral proxy; supplier unresolved) |
| L12 | Biconcave Negative | Unmatched (nd 1.85, vd 22.73 high-index flint class) |
| L13 | Biconvex Positive | Unmatched (nd 1.83, vd 37.22 high-index lanthanum/flint class) |
| L14 | Biconvex Positive | Dense-flint class (nd 1.85, vd 23.78; vendor unresolved) |
| L21 | Biconcave Negative | E-FD15 (catalog-equivalent spectral proxy; supplier unresolved) |
| L22 | Biconvex Positive | J-FK01A (catalog-equivalent spectral proxy; supplier unresolved) |
| L23 | Biconvex Positive (2× Asph) | K-VC89 (catalog-equivalent spectral proxy; supplier unresolved) |
| L31 | Negative Meniscus (2× Asph) | K-VC80-M (catalog-equivalent spectral proxy; supplier unresolved) |
| L41 | Biconvex Positive | Unmatched (ED-class 1.49/81.59; common 497816 family differs by delta-n about +0.007) |
| L42 | Negative Meniscus | H-ZF1 (catalog-equivalent spectral proxy; supplier unresolved) |