US 2004/0223070 A1, Numerical Example 4 — Takashi Shirasuna
| 10 ELEMENTS / 9 GROUPS |
| PATENT 28.90-101.35mm |
| MARKETED 28-105mm f/4-5.6 |
| 1 ASPHERICAL SURFACE |
| L2 INNER FOCUS |
Inner focus by rigid L2 translation. Published infinity D3/D9 retained; finite endpoints are independent paraxial 0.48 m image-plane conjugates with physical source L5 restored, not patent or production cam measurements.
| Element | Type | Glass |
|---|---|---|
| L11 | Biconvex Positive | S-LAL14 (OHARA catalog equivalent; qualified spectral proxy; historical supplier unconfirmed, 697-555) |
| L12 | Biconcave Negative | PBH53 / PBH53W (OHARA historical equivalent; qualified spectral proxy; historical supplier unconfirmed, 847-239) |
| L21 | Negative Meniscus | S-LAM60 (OHARA catalog equivalent; qualified spectral proxy; historical supplier unconfirmed, 743-493) |
| L22 | Biconcave Negative | S-LAL8 (OHARA catalog equivalent; qualified spectral proxy; historical supplier unconfirmed, 713-539) |
| L23 | Positive Meniscus | PBH53 / PBH53W (OHARA historical equivalent; qualified spectral proxy; historical supplier unconfirmed, 847-239) |
| L31 | Biconvex Positive | S-LAL14 (OHARA catalog equivalent; qualified spectral proxy; historical supplier unconfirmed, 697-555) |
| L32 | Negative Meniscus | PBH53 / PBH53W (OHARA historical equivalent; qualified spectral proxy; historical supplier unconfirmed, 847-239) |
| L41 | Biconvex Positive | S-FSL5 (OHARA catalog equivalent; qualified spectral proxy; historical supplier unconfirmed, 487-702) |
| L42 | Negative Meniscus (rear asphere) | POLYCARB (published MISC catalog; qualified numerical polymer proxy; source chemistry and supplier unspecified) |
| L51 | Plane-Parallel Plate | S-BSL7 (qualified 517641 spectral proxy; historical supplier unconfirmed) |