US 2024/0192474 A1 Example 4 — Canon / 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 (neg. meniscus) moves image-ward, L6 (pos. meniscus, GMo asph) moves object-ward. Driven by two independent Nano USM motors. Close-focus gap data not available from patent; identical inf/close values used.
| Element | Type | Glass |
|---|---|---|
| L1 | Biconcave Negative | Lanthanum dense flint (900/374) |
| L2 | Biconvex Positive | Phosphate crown (538/747) |
| L3 | Biconvex Positive | Lanthanum crown (729/547) |
| L4 | Biconvex Positive | Lanthanum crown (729/547) |
| L5 | Negative Meniscus | Dense lanthanum flint (883/408) |
| L6 | Biconcave Negative | Barium crown (595/677) |
| L7 | Biconcave Negative | UD fluorophosphate crown (497/815) |
| L8 | Biconvex Positive | Heavy flint (770/297) |
| L9 | Biconvex Positive | Very heavy flint (847/238) |
| L10 | Positive Meniscus | Extreme dense flint — OHARA S-NPH4 (001/291) |
| L11 | Biconvex Positive | Borosilicate crown (517/524) |
| L12r | Neg. Meniscus (1× Asph) | UV-curing optical resin (replica aspheric) |
| L13 | Negative Meniscus | Lanthanum crown (773/496) |
| L14 | Biconvex Positive | UD fluorophosphate crown (497/815) |
| L15 | Negative Meniscus | Lanthanum dense flint (900/374) |
| L16 | Biconvex Positive | UD fluorophosphate crown (497/815) |
| L17 | Biconvex Positive | UD fluorophosphate crown (497/815) |
| L18 | Neg. Meniscus (1× Asph) | OHARA L-LAH86 PGM glass (854/404) |
| L19 | Biconvex Positive | Barium crown (603/606) |
| L20 | Negative Meniscus | Lanthanum crown (729/547) |
| L21 | Pos. Meniscus (1× Asph) | OHARA L-BAL42 PGM glass (583/594) |
| L22 | Biconvex Positive | Heavy flint (805/254) |
| L23 | Biconcave Negative | Fluorocrown (487/702) |
| L24 | Negative Meniscus | Extreme dense flint — OHARA S-NPH3 (001/255) |
Detailed analysis available in the interactive viewer above.