US 2024/0192474 A1, Numerical Example 4 — Shunji Iwamoto
| 23 ELEMENTS / 18 GROUPS |
| f = 24.78–102.06 mm |
| F/2.9 (constant) |
| 2ω ≈ 82.2–24.0° |
| 3 ASPHERICAL SURFACES (2 GMo + 1 Replica) |
Dual-group floating focus: L5 (negative meniscus) and L6 (positive meniscus, aspherical S37) both move toward the image when focusing close (patent ¶0069), driven by two Nano USM motors. The patent publishes no close-focus gaps, so focus travel is not modeled; 0.45 m is Canon's production minimum focus distance.
| Element | Type | Glass |
|---|---|---|
| L1 | Biconcave Negative | TAFD37A (HOYA) |
| L2 | Biconvex Positive | S-FPM3 (OHARA) |
| L3 | Biconvex Positive | S-LAL18 (OHARA) |
| L4 | Biconvex Positive | S-LAL18 (OHARA) |
| L5 | Negative Meniscus | S-LAH58 (OHARA) |
| L6 | Biconcave Negative | S-FPM2 (OHARA) |
| L7 | Biconcave Negative | S-FPL51 (OHARA) |
| L8 | Biconvex Positive | NBFD29 (HOYA, 770297) |
| L9 | Biconvex Positive | S-TIH53 (OHARA) |
| L10 | Negative Meniscus | S-LAH99 (OHARA) |
| L11 | Biconvex Positive | S-NSL36 (OHARA) |
| L12r | Neg. Meniscus (1× Asph) | UV-curing optical resin (replica aspheric) |
| L13 | Negative Meniscus | S-LAH66 (OHARA) |
| L14 | Biconvex Positive | S-FPL51 (OHARA) |
| L15 | Negative Meniscus | TAFD37A (HOYA) |
| L16 | Biconvex Positive | S-FPL51 (OHARA) |
| L17 | Biconvex Positive | S-FPL51 (OHARA) |
| L18 | Neg. Meniscus (1× Asph) | L-LAH85V (OHARA) |
| L19 | Biconvex Positive | S-BSM14 (OHARA) |
| L20 | Negative Meniscus | S-LAL18 (OHARA) |
| L21 | Pos. Meniscus (1× Asph) | L-BAL42 (OHARA) |
| L22 | Biconvex Positive | S-TIH6 (OHARA) |
| L23 | Biconcave Negative | S-FSL5 (OHARA) |
| L24 | Negative Meniscus | TAFD40 (HOYA) |