US 8,867,144 B2 — Hisayuki Yamanaka
| 23 ELEMENTS / 17 GROUPS |
| 70-200mm f/2.8 (MARKETING) |
| 71.800-194.500mm F/2.90 (PATENT DESIGN) |
| PUBLISHED 1.3m CLOSE-FOCUS STATES |
| TRANSVERSE VC SUBSET 5B |
PUBLISHED Example-1 focus states: LG3 alone translates objectward from infinity to the 1.3 m state; d10 shortens exactly as d17 lengthens at each zoom position. No internal focus reconstruction is used.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | NBFD15-W (Hoya) |
| L2 | Positive Meniscus | FCD100 (Hoya) |
| L3 | Positive Meniscus | FCD1 (Hoya) |
| L4 | Positive Meniscus | FCD1 (Hoya) |
| L5 | Positive Meniscus | TAFD25 (Hoya) |
| L6 | Biconcave Negative | LAC14 (Hoya) |
| L7 | Negative Meniscus | PCD4 (Hoya) |
| L8 | Negative Meniscus | FC5 (Hoya) |
| L9 | Positive Meniscus | FD60 (Hoya) |
| L10 | Biconcave Negative | TAFD5G (Hoya) |
| L11 | Biconvex Positive | TAF1 (Hoya) |
| L12 | Biconvex Positive | FC5 (Hoya) |
| L13 | Biconcave Negative | TAFD5G (Hoya) |
| L14 | Biconvex Positive | TAC8 (Hoya) |
| L15 | Positive Meniscus | FCD1 (Hoya) |
| L16 | Biconcave Negative | NBFD15-W (Hoya) |
| L17 | Biconvex Positive | FCD1 (Hoya) |
| L18 | Positive Meniscus | FD60 (Hoya) |
| L19 | Biconcave Negative | BAC4 (Hoya) |
| L20 | Biconcave Negative | E-F5 (Hoya) |
| L21 | Biconvex Positive | LAC14 (Hoya) |
| L22 | Negative Meniscus | TAFD25 (Hoya) |
| L23 | Biconvex Positive | FDS90 (Hoya) |