JP1969-025743 — Toshinobu Ogura
| 7 elements / 7 groups |
| 28mm |
| f/3.5 |
| 2ω = 75° (patent) |
Focus travel is not modeled: JP1969-025743 Example 2 supplies one fixed optical state only; 0.6 m is production minimum-focus metadata and no internal focus motion is modeled.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | K-LaK11 class (coordinate-compatible spectral proxy; native d 1.6583/58.5; supplier/melt unproven) |
| L2 | Plano-Convex Positive | LAFN7 class (coordinate-compatible spectral proxy; coordinate code 750350; supplier/melt unproven) |
| L3 | Negative Meniscus | N-BK7 class (coordinate-compatible spectral proxy; coordinate code 517642; supplier/melt unproven) |
| L4 | Biconvex Positive | S-BAH10 class (coordinate-compatible spectral proxy; coordinate code 670472/670473; supplier/melt unproven) |
| L5 | Biconcave Negative | SF15 class (coordinate-compatible spectral proxy; native d 1.7006/30.1; supplier/melt unproven) |
| L6 | Positive Meniscus | LAC10 class (coordinate-compatible spectral proxy; coordinate code 720503; supplier/melt unproven) |
| L7 | Plano-Convex Positive | N-BK7 class (coordinate-compatible spectral proxy; coordinate code 517642; supplier/melt unproven) |