US 2007/0229969 A1 — Hiroyuki Matsumoto
| 14 ELEMENTS / 10 GROUPS |
| MARKETED 16-80mm f/3.5-4.5 |
| PATENT 16.4-78.0mm f/3.61-4.64 |
| 2 ASPHERICAL SURFACES |
| 0.35 m MFD |
CONSTRAINED_RECONSTRUCTION: patent ¶0350 specifies GR2-only focusing. Close-focus pairs are code-solved at the Sony 0.35 m MFD with d6+d16 conserved at each zoom anchor; they are not patent-published finite-object rows.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | 847238 — dense flint coordinate class (vendor non-unique) |
| L2 | Biconvex Positive | 835430 — high-index lanthanum-flint coordinate class (exact current melt unresolved) |
| L3 | Positive Meniscus | 835430 — high-index lanthanum-flint coordinate class (exact current melt unresolved) |
| L4 | Neg. Meniscus (1× Asph) | M-TAF101 (HOYA catalog-equivalent coefficient proxy; production supplier unspecified) |
| L5 | Positive Meniscus | 805255 — dense flint coordinate class (vendor non-unique) |
| L6 | Biconcave Negative | 883408 — lanthanum high-index coordinate class (vendor non-unique) |
| L7 | Biconvex Positive | 762266 — dense flint coordinate class (vendor non-unique) |
| L8 | Negative Meniscus | 883408 — lanthanum high-index coordinate class (vendor non-unique) |
| L9 | Negative Meniscus | 835430 — high-index lanthanum-flint coordinate class (exact current melt unresolved) |
| L10 | Biconvex Positive | 569560 — barium crown coordinate class (vendor non-unique) |
| L11 | Biconvex Positive | 517642 — crown coordinate class (vendor non-unique) |
| L12 | Biconcave Negative (1× Asph) | M-TAF101 (HOYA catalog-equivalent coefficient proxy; production supplier unspecified) |
| L13 | Biconcave Negative | 904313 — high-index lanthanum coordinate class (vendor non-unique) |
| L14 | Biconvex Positive | 517642 — crown coordinate class (vendor non-unique) |