US 2019/0278068 A1, Numerical Example 2 — Takahiro Hatada
| 18 ELEMENTS / 14 GROUPS |
| f = 24.72 – 101.84 mm |
| F/4.12 (design) |
| 2ω ≈ 82.4° – 24.0° |
| 6 ASPHERICAL SURFACES (3 ELEMENTS) |
| 1 UD ELEMENT |
Inner focus — L4 (single negative meniscus) moves toward the image. The patent publishes infinity spacings only; close-focus travel is calculated for Canon's 0.45 m MFD at every zoom station.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | S-NPH1 (OHARA) (compatible spectral proxy; historical supplier, melt, chemistry and process unspecified) |
| L2 | Plano-Convex | S-LAL18 (OHARA) (compatible spectral proxy; historical supplier, melt, chemistry and process unspecified) |
| L3 | Positive Meniscus | S-LAL18 (OHARA) (compatible spectral proxy; historical supplier, melt, chemistry and process unspecified) |
| L4 | Negative Meniscus | S-LAH98 (OHARA) (compatible spectral proxy; historical supplier, melt, chemistry and process unspecified) |
| L5 | Biconcave (2× Asph) | L-BAL42 (OHARA PGM) (compatible spectral proxy; historical supplier, melt, chemistry and process unspecified) |
| L6 | Biconvex Positive | S-NPH1 (OHARA) (compatible spectral proxy; historical supplier, melt, chemistry and process unspecified) |
| L7 | Negative Meniscus | S-LAH65V (OHARA) (compatible spectral proxy; historical supplier, melt, chemistry and process unspecified) |
| L8 | Plano-Convex | TAFD35 (HOYA catalog equivalent) (compatible spectral proxy; historical supplier, melt, chemistry and process unspecified) |
| L9 | Negative Meniscus | S-LAH98 (OHARA) (compatible spectral proxy; historical supplier, melt, chemistry and process unspecified) |
| L10 | Biconvex Positive | S-FPM2 (OHARA catalog equivalent) (compatible spectral proxy; historical supplier, melt, chemistry and process unspecified) |
| L11 | Biconcave Negative | S-NBH51 (OHARA) (compatible spectral proxy; historical supplier, melt, chemistry and process unspecified) |
| L12 | Positive Meniscus | TAFD40 (HOYA) (compatible spectral proxy; historical supplier, melt, chemistry and process unspecified) |
| L13 | Negative Meniscus | S-TIH11 (OHARA) (compatible spectral proxy; historical supplier, melt, chemistry and process unspecified) |
| L14 | Plano-Convex | S-FPL51 (OHARA) (compatible spectral proxy; historical supplier, melt, chemistry and process unspecified) |
| L15 | Biconvex Positive (2× Asph) | L-BAL42 (OHARA PGM) (compatible spectral proxy; historical supplier, melt, chemistry and process unspecified) |
| L16 | Negative Meniscus | S-LAL18 (OHARA) (compatible spectral proxy; historical supplier, melt, chemistry and process unspecified) |
| L17 | Negative Meniscus (2× Asph) | L-LAH91 (OHARA catalog-equivalent; patent supplier unspecified) (compatible spectral proxy; historical supplier, melt, chemistry and process unspecified) |
| L18 | Positive Meniscus | S-LAH65V (OHARA) (compatible spectral proxy; historical supplier, melt, chemistry and process unspecified) |