JP 2016-133764 A — Atsuo Masui, Yasunari Fukuda
| 14 ELEMENTS / 11 GROUPS |
| MODEL EFL ≈ 11.308-22.366 mm |
| F/3.6-4.61 |
| 4 ASPHERICAL SURFACES |
Focus motion not modeled: JP 2016-133764 A Example 6 publishes infinity-focus wide/middle/tele spacings only and names no focus group. Leica specifies 0.2 m minimum focus; the zoom gaps are repeated at both focus endpoints.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | 729547 — lanthanum crown class (supplier unproven) |
| L2 | Neg. Meniscus (2× Asph) | L-LAH84 spectral proxy (patent 809404 coordinate; low-Tg class inferred; supplier unconfirmed) |
| L3 | Positive Meniscus | 699301 — dense flint class (supplier unproven) |
| L4 | Biconcave Negative | 497816 — ultra-low-dispersion crown class (supplier unproven) |
| L5 | Positive Meniscus | 596392 — flint class (supplier unproven) |
| L6 | Negative Meniscus | 911353 — high-index lanthanum dense flint class (supplier unproven) |
| L7 | Biconvex Positive | 497816 — ultra-low-dispersion crown class (supplier unproven) |
| L8 | Biconcave Negative | 911353 — high-index lanthanum dense flint class (supplier unproven) |
| L9 | Biconvex Positive | 497816 — ultra-low-dispersion crown class (supplier unproven) |
| L10 | Biconvex Positive (2× Asph) | 583594 — barium/crown class (supplier unproven) |
| L11 | Biconvex Positive | 847238 — high-dispersion/high-transmission flint class (supplier unproven) |
| L12 | Biconcave Negative | 773496 — lanthanum high-index class (supplier unproven) |
| L13 | Biconvex Positive | 618634 — phosphate crown class (supplier unproven) |
| L14 | Negative Meniscus | 904313 — high-index lanthanum flint class (supplier unproven) |