JP 2007-108398 A, Numerical Example 1 — Hiroshi Endo
| 21 ELEMENTS (19 GLASS + 2 RESIN) / 12 GROUPS |
| f = 17.50–53.44 mm |
| F/2.9 (marketed f/2.8) |
| 2ω = 75.9°–28.7° |
| 3 ASPHERICAL SURFACES (2 RESIN HYBRID, 1 GLASS) |
Inferred inner focus: Group 2 moves toward the object at wide/middle using approximate 0.35 m endpoints; tele focus endpoints remain identical to infinity because no finite cam is reconstructed. The original publishes infinity spacings only. These controls do not establish production finite-focus behavior.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | PBH53 (compatible catalog spectral proxy; source supplier, melt and chemistry unresolved) |
| L2 | Biconvex Positive | S-BSM14 (compatible catalog spectral proxy; source supplier, melt and chemistry unresolved) |
| L3 | Positive Meniscus | S-LAL8 (compatible catalog spectral proxy; source supplier, melt and chemistry unresolved) |
| Resin1 | Negative Meniscus (1× Asph) | Unmatched optical resin (original resin label and published d/C/F/g; chemistry unresolved) |
| L4g | Negative Meniscus | S-LAH65V (compatible catalog spectral proxy; source supplier, melt and chemistry unresolved) |
| L5 | Biconcave Negative | S-LAH55V (compatible catalog spectral proxy; source supplier, melt and chemistry unresolved) |
| L6 | Biconvex Positive | S-LAH60 (compatible catalog spectral proxy; source supplier, melt and chemistry unresolved) |
| L7 | Biconcave Negative | S-LAH65V (compatible catalog spectral proxy; source supplier, melt and chemistry unresolved) |
| L8 | Biconvex Positive | S-TIH6 (compatible catalog spectral proxy; source supplier, melt and chemistry unresolved) |
| L9 | Biconvex Positive | S-BAL35 (compatible catalog spectral proxy; source supplier, melt and chemistry unresolved) |
| L10 | Biconvex Positive (1× Asph) | S-BAL42 (compatible catalog spectral proxy; source supplier, melt and chemistry unresolved) |
| L11 | Negative Meniscus | PBH53 (compatible catalog spectral proxy; source supplier, melt and chemistry unresolved) |
| L12 | Positive Meniscus | PBH53 (compatible catalog spectral proxy; source supplier, melt and chemistry unresolved) |
| L13 | Biconcave Negative | S-LAL14 (compatible catalog spectral proxy; source supplier, melt and chemistry unresolved) |
| L14 | Negative Meniscus | PBH53 (compatible catalog spectral proxy; source supplier, melt and chemistry unresolved) |
| L15 | Positive Meniscus | S-BAL35 (compatible catalog spectral proxy; source supplier, melt and chemistry unresolved) |
| Resin2 | Positive Meniscus (1× Asph) | Unmatched optical resin (original resin label and published d/C/F/g; chemistry unresolved) |
| L16a | Negative Meniscus | S-LAH60 (compatible catalog spectral proxy; source supplier, melt and chemistry unresolved) |
| L17 | Biconvex Positive | S-FPL51 (compatible catalog spectral proxy; source supplier, melt and chemistry unresolved) |
| L18 | Biconvex Positive | S-FPL51 (compatible catalog spectral proxy; source supplier, melt and chemistry unresolved) |
| L19 | Negative Meniscus | S-NBH51 (compatible catalog spectral proxy; source supplier, melt and chemistry unresolved) |