US 10,545,321 B2 — Yoshito Iwasawa, Jun Takahashi
| 20 ELEMENTS / 13 GROUPS |
| PATENT ZOOM POINTS 152.1633-582.5200 mm |
| MODELED F/4.99415-6.54062 |
| MARKETED 150-600mm f/5-6.3 |
| 5-GROUP ZOOM / PUBLISHED INNER FOCUS |
| ALL-SPHERICAL |
PUBLISHED inner focus: G4 moves objectward at close focus; source D29/D36 pairs conserve their sum at each zoom position.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | 834373 class (vendor unresolved) |
| L2 | Biconvex Positive | 497816 class (low-dispersion crown; vendor unresolved) |
| L3 | Positive Meniscus | 497816 class (low-dispersion crown; vendor unresolved) |
| L4 | Biconvex Positive | 805255 class (vendor unresolved) |
| L5 | Biconcave Negative | 729547 class (vendor unresolved) |
| L6 | Negative Meniscus | 805396 class (vendor unresolved) |
| L7 | Positive Meniscus | 805255 class (vendor unresolved) |
| L8 | Biconcave Negative | 904313 class (vendor unresolved) |
| L9 | Biconvex Positive | 497816 class (low-dispersion crown; vendor unresolved) |
| L10 | Biconvex Positive | 487704 class (vendor unresolved) |
| L11 | Biconvex Positive | 487704 class (vendor unresolved) |
| L12 | Negative Meniscus | 904313 class (vendor unresolved) |
| L13 | Biconcave Negative | 744448 class (vendor unresolved) |
| L14 | Positive Meniscus | 806333 class (vendor unresolved) |
| L15 | Biconvex Positive | 517522 class (vendor unresolved) |
| L16 | Biconvex Positive | 518590 class (vendor unresolved) |
| L17 | Biconcave Negative | 904313 class (vendor unresolved) |
| L18 | Negative Meniscus | 835427 class (vendor unresolved) |
| L19 | Biconcave Negative | 487704 class (vendor unresolved) |
| L20 | Biconvex Positive | 720347 class (vendor unresolved) |