US 4,452,513 — Yoshinari Hamanishi
| 13 ELEMENTS / 9 GROUPS |
| 80-200mm f/4 (MARKETED) |
| 80.0-195.2mm f/4 (DESIGN) |
| 1.2m CLOSE FOCUS |
| ALL-SPHERICAL |
CONSTRAINED_RECONSTRUCTION: Nikon specifies a 1.2 m focal-plane minimum distance and parfocal one-ring operation. G1-only travel is code-solved as 17.047774 mm at 80 mm and 17.048840 mm at 195.2 mm, with G2-G4 and the image plane fixed. Patent 0.998 m and 0.680 m test states are not exposed.
| Element | Type | Glass |
|---|---|---|
| L11a | Negative Meniscus | 805254 — dense flint class (catalog unresolved) |
| L11b | Biconvex Positive | 620603 — crown class (catalog unresolved) |
| L12 | Positive Meniscus | 517641 — crown class (catalog unresolved) |
| L2a | Biconcave Negative | 788475 — dense lanthanum glass class (catalog unresolved) |
| L2b | Biconvex Positive | 755276 — dense flint class (catalog unresolved) |
| L2c | Biconcave Negative | 581408 — light flint class (catalog unresolved) |
| L22 | Biconcave Negative | 589612 — crown class (catalog unresolved) |
| L3a | Biconvex Positive | 620603 — crown class (catalog unresolved) |
| L3b | Negative Meniscus | 755276 — dense flint class (catalog unresolved) |
| L41 | Positive Meniscus | S-LAL52 (OHARA catalog equivalent for patent 670576; production supplier unspecified) |
| L42 | Biconcave Negative | J-LAFH3 (HIKARI; 795287 match to patent 795286 class) |
| L43 | Negative Meniscus | 797455 — dense lanthanum glass class (catalog unresolved) |
| L44 | Biconvex Positive | 583465 — barium flint class (catalog unresolved) |