JP 2007-003600 A, Numerical Example 1 — Takashi Shirasuna
| 15 elements / 10 groups |
| Patent design: 72.4-290.0 mm |
| Production: 70-300mm f/4-5.6 |
| All spherical |
| L2 image-stabilization unit |
Focus travel is unavailable: the patent publishes infinity-focus zoom states only. The 1.5 m limit is a production specification; no internal focus motion is modeled.
| Element | Type | Glass |
|---|---|---|
| E1 | Negative Meniscus | 750353 — high-index flint class (vendor unresolved) |
| E2 | Biconvex Positive | 487702 — low-dispersion crown class (vendor unresolved) |
| E3 | Biconvex Positive | 516641 — borosilicate crown class (vendor unresolved) |
| E4 | Biconcave Negative | 713539 — lanthanum crown class (vendor unresolved) |
| E5 | Biconcave Negative | 603606 — dense crown class (vendor unresolved) |
| E6 | Biconvex Positive | 847239 — high-index flint class (vendor unresolved) |
| E7 | Biconvex Positive | 497815 — low-dispersion fluorophosphate / ED class (vendor unresolved) |
| E8 | Biconvex Positive | 487702 — low-dispersion crown class (vendor unresolved) |
| E9 | Plano-Concave Negative | 834372 — lanthanum flint class (vendor unresolved) |
| E10 | Negative Meniscus | 516641 — borosilicate crown class (vendor unresolved) |
| E11 | Biconvex Positive | 603606 — dense crown class (vendor unresolved) |
| E12 | Negative Meniscus | 805254 — dense flint class (vendor unresolved) |
| E13 | Plano-Convex Positive | S-BAL35 — catalog-equivalent barium crown for patent 589611 (production supplier unspecified) |
| E14 | Biconcave Negative | 773496 — high-index lanthanum class (vendor unresolved) |
| E15 | Positive Meniscus | 805254 — dense flint class (vendor unresolved) |