KR 101802036 B1 — Jong Young Park, Hyun Sik Yoon
| 11 ELEMENTS / 7 GROUPS |
| DESIGN f = 130 mm |
| DESIGN F/2.07 |
| ALL-SPHERICAL; 1 ED ELEMENT |
Infinity prescription only. The manufacturer specifies manual floating focus and 0.8 m MFD; the patent gives no quantitative near-focus spacings or stop motion. No internal travel or near-focus performance is modeled.
| Element | Type | Glass |
|---|---|---|
| L1 | Positive Meniscus | TAF1 (Hoya; source Vd 49.62 retained, current catalog 49.63) |
| L2 | Biconvex Positive | FCD1 (Hoya) |
| L3 | Biconcave Negative | FDS90 (Hoya) |
| L4 | Biconvex Positive | N-SF66 (Schott; source label NSF66_SCHOTT) |
| L5 | Biconcave Negative | SF1 (Schott spectral proxy for patent NSF1_SCHOTT; source νd 29.50 retained) |
| L6 | Positive Meniscus | TAC6 (Hoya) |
| L7 | Biconcave Negative | SF1 (Schott spectral proxy for patent NSF1_SCHOTT; source νd 29.50 retained) |
| L8 | Biconvex Positive | FDS90 (Hoya) |
| L9 | Biconcave Negative | FF5 (Hoya) |
| L10 | Negative Meniscus | SF1 (Schott spectral proxy for patent NSF1_SCHOTT; source νd 29.50 retained) |
| L11 | Biconvex Positive | TAC6 (Hoya) |