US 2024/0151940 A1, Embodiment 1 — Ju Yeon Jo
| 11 ELEMENTS / 8 GROUPS |
| 24mm f/1.8 (MARKETED) |
| PATENT EFL 24.8004 mm / F1.86 |
| 4 ASPHERICAL SURFACES |
| PUBLISHED INNER FOCUS |
PUBLISHED inner focus: G21 (L71 + L81) translates objectward while G11/G31 stay fixed. D1/D2 are 10.562/1.000 mm at infinity, 10.155/1.407 mm at the published intermediate state, and 7.642/3.920 mm at the patent nearest state; D1 + D2 remains 11.562 mm.
| Element | Type | Glass |
|---|---|---|
| L11 | Negative Meniscus | 697555 — lanthanum-crown class (vendor unresolved) |
| L21 | Biconcave Negative | 847238 — high-index dense-flint class (vendor unresolved) |
| L31 | Biconvex Positive | 835427 — high-index flint class (vendor unresolved) |
| L41 | Biconvex Positive | 001291 — ultra-high-index flint class (vendor unresolved) |
| L51 | Positive Meniscus | 497816 — low-dispersion crown class (vendor unresolved) |
| L61 | Negative Meniscus | 603380 — flint class (vendor unresolved) |
| L71 | Neg. Meniscus (2× Asph) | 689312 — dense-flint class (vendor unresolved) |
| L81 | Biconvex Positive | 593670 — dense phosphate-crown class (vendor unresolved) |
| L91 | Biconcave Negative (2× Asph) | 689312 — dense-flint class (vendor unresolved) |
| L101 | Biconvex Positive | 497816 — low-dispersion crown class (vendor unresolved) |
| L111 | Negative Meniscus | 581409 — light-flint class (vendor unresolved) |