US 2014/0368925 A1 — Daiki Kawamura
| 12 ELEMENTS / 10 GROUPS |
| MARKETED 16–50mm f/3.5–5.6 |
| EXAMPLE 1 f=16.49–48.56mm, F No.=3.60–5.59 |
| 3 ASPHERICAL ELEMENTS / 6 ASPHERICAL SURFACES |
| 1 ED-CLASS ELEMENT |
| OIS |
NO_INTERNAL_RECONSTRUCTION — patent infinity states only; L41 focuses axially while L42/G5 remain fixed, but no finite-focus spacing law is authored.
| Element | Type | Glass |
|---|---|---|
| L11 | Negative Meniscus | S-NPH2 class (OHARA coordinate match; supplier unconfirmed) |
| L12 | Positive Meniscus | 835427 lanthanum class (supplier unconfirmed) |
| L21 | Negative Meniscus | S-LAH58 class (OHARA coordinate match; supplier unconfirmed) |
| L22 | Biconcave Negative (2× Asph) | Q-SK52S (HIKARI) — near-coordinate spectral proxy; supplier unspecified |
| L23 | Positive Meniscus | FDS18 class (HOYA coordinate match; supplier unconfirmed) |
| L31 | Biconvex Positive (2× Asph) | Unmatched (nd 1.80348 / νd 40.44; nearest audited S-LAH63 differs) |
| L32 | Plano-Concave Negative | S-NBH55 class (OHARA coordinate match; supplier unconfirmed) |
| L33 | Biconvex Positive | 497816 ED/low-dispersion crown class (S-FPL51 coordinate; supplier unconfirmed) |
| L34 | Biconcave Negative (2× Asph) | L-BAL43 (OHARA) — near-coordinate spectral proxy; supplier unspecified |
| L41 | Biconvex Positive | 618634 crown/phosphate-crown class (supplier unconfirmed) |
| L42 | Plano-Concave Negative | S-TIL2 class (OHARA coordinate match; supplier unconfirmed) |
| L5 | Plano-Convex Positive | S-LAL8 class (OHARA near-coordinate match; supplier unconfirmed) |