JP 1982-019708 A, Example 1 — Tadashi Kojima, Takashi Matsumaru
| 8 ELEMENTS / 7 GROUPS |
| 35-70mm MARKETING / 36.003-68.092mm PATENT |
| f/4 MARKETING / f/3.5 PATENT MODEL |
| ALL-SPHERICAL |
CONSTRAINED_RECONSTRUCTION: Example 1 publishes only infinity zoom spacings. The patent states that normal focusing extends the front group, while Konica's production specification gives 0.8 m minimum focus measured from the film plane. D7 close-focus values are code-solved at each zoom state for that film-plane conjugate with the rear group and D15 held fixed. No additional internal movement is invented.
| Element | Type | Glass |
|---|---|---|
| E1 | Biconvex Positive | 658509 class (vendor unresolved) |
| E2 | Biconvex Positive | 620363 class (vendor unresolved) |
| E3 | Biconcave Negative | 806409 class (vendor unresolved) |
| E4 | Positive Meniscus | 805254 class (vendor unresolved) |
| E5 | Biconvex Positive | 658509 class (vendor unresolved) |
| E6 | Positive Meniscus | 603607 class (vendor unresolved) |
| E7 | Biconcave Negative | 805254 class (vendor unresolved) |
| E8 | Biconvex Positive | 620363 class (vendor unresolved) |