US 2024/0329367 A1, Numerical Example 1 — Yasuaki Hagiwara
| 15 ELEMENTS / 12 GROUPS |
| f = 28.80–67.90 mm (2.36×) |
| F/2.88–2.92 |
| 2ω = 69.9–35.3° |
| 4 ASPHERICAL SURFACES (2 GMo ELEMENTS) |
| 2 UD ELEMENTS |
Rear inner focus via B6 (single negative meniscus L13). Patent ¶0042/¶0065: B6 moves toward the image side from infinity to close. Close-focus spacings are not published for Example 1, so the gaps are zoom-only and the focus slider does not move B6.
| Element | Type | Glass |
|---|---|---|
| L1 | Biconvex Positive | S-FPL51 (OHARA) |
| L2 | Negative Meniscus | S-LAH92 (OHARA catalog equivalent; patent 892371) |
| L3 | Biconcave Negative | S-BSM14 (OHARA catalog equivalent; patent 603606) |
| L4 | Positive Meniscus | S-LAH95 (OHARA catalog equivalent; patent 904313) |
| L5 | Negative Meniscus | S-LAH89 (OHARA) |
| L6 | Biconvex Positive | S-LAH99 (OHARA catalog equivalent; patent 001291) |
| L7 | Biconvex Positive (2× Asph) | L-BAL42 (OHARA) |
| L8 | Biconcave Negative | NBFD29 (HOYA, 770297) |
| L9 | Plano-Concave Negative | S-NBH56 (OHARA catalog equivalent; patent 855248) |
| L10 | Biconvex Positive | S-FPL51 (OHARA) |
| L11 | Biconvex Positive (2× Asph) | L-BAL42 (OHARA) |
| L12 | Biconvex Positive | S-FPM2 (OHARA catalog equivalent; patent 595677) |
| L13 | Negative Meniscus | S-NBM51 (OHARA catalog equivalent; patent 613443) |
| L14 | Biconcave Negative | S-LAM2 (OHARA) |
| L15 | Biconvex Positive | PBH21 (OHARA; historical 923209) |