KR 10-1825708 B1, Numerical Example 1 — Jae Myung Ryu, Hae Jin Lee, Jung Du Lee
| 9 ELEMENTS / 8 GROUPS |
| 50mm f/1.4 MARKETED; 51.0386mm f/1.44 DESIGN |
| 47.0° FULL-FRAME FIELD |
| 3 ASPHERICAL ELEMENTS / 6 ASPHERICAL SURFACES |
| SINGLE-ELEMENT INNER FOCUS |
Reconstructed inner focus: L7–1/G2 moves imageward while G1 and G3 remain fixed. The modeled close state focuses at the marketed 0.45 m distance with a fixed image plane. The patent’s close row changes an image-side spacing, so this endpoint is calculated rather than directly published.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | 648338 class (vendor not identified by patent) |
| L2 | Plano-Convex Positive | 001255 class (vendor not identified by patent) |
| L3 | Neg. Meniscus (2× Asph) | Unmatched (684313 class; catalog identity unresolved) |
| L4 | Biconcave Negative | 728283 class (vendor not identified by patent) |
| L5 | Biconvex Positive | 697555 class (vendor not identified by patent) |
| L6 | Biconvex Positive | 883408 class (vendor not identified by patent) |
| L7 | Neg. Meniscus (2× Asph) | Unmatched (684313 class; catalog identity unresolved) |
| L8 | Biconvex Positive (2× Asph) | K-VC80-M catalog-equivalent (patent coordinates retained; production supplier unspecified) |
| L9 | Biconcave Negative | 569560 class (vendor not identified by patent) |