US 2023/0213739 A1 Example 1 — Canon / Nakahara & Okuoka
| 8 ELEMENTS / 8 GROUPS |
| f ≈ 24.7–48.5 mm |
| F/4.63–6.48 |
| 2ω ≈ 72.5–46.2° |
| 3 ASPHERICAL SURFACES (2 PMo) |
Inner focus — LP (single positive meniscus, f ≈ 63 mm) moves toward object. Lead screw STM drive.
| Element | Type | Glass |
|---|---|---|
| G1 | Negative Meniscus | S-BSL7 (OHARA 639/554) |
| G2 | Neg. Meniscus (1× Asph) | COP resin / ZEONEX E48R (531/559) |
| L1P | Positive Meniscus | S-TIM35 (OHARA 699/301) |
| L2a | Biconvex Positive | S-LAH95 (OHARA 904/313) |
| L2b | Biconcave Negative | S-NPH53 (OHARA 847/239) |
| L2c | Biconvex Positive | S-LAH66 (OHARA 773/496) |
| LP | Positive Meniscus | S-FSL5 (OHARA 487/702) |
| L4 | Neg. Meniscus (2× Asph) | COP resin / ZEONEX E48R (531/559) |
Detailed analysis available in the interactive viewer above.