JP 2023-183894 A Example 1 — Sigma / Yamamoto
| 14 ELEMENTS / 11 GROUPS |
| f = 48.72 mm |
| F/1.45 |
| 2ω = 46.49° |
| 3 ASPHERICAL LENSES (5 SURFACES) |
| 1 SLD ELEMENT |
Single-element inner focus. L8 (GR1) — negative meniscus with 2× aspherical surfaces — translates toward image. GF, stop, and GR2 fixed. HLA linear motor drive.
| Element | Type | Glass |
|---|---|---|
| L1 | Biconvex Positive | S-NPH53 (OHARA) |
| L2 | Biconcave Negative | S-TIL25 (OHARA) |
| L3 | Biconcave Negative | S-TIH6 (OHARA) |
| L4 | Biconvex Positive (2× Asph) | Aspherical mold glass (764/491) |
| L5 | Biconvex Positive | K-VC89 (Sumita) / FCD515 class — SLD fluorophosphate crown |
| L6 | Negative Meniscus | S-TIH11 (OHARA) |
| L7 | Biconvex Positive | S-LAH58 (OHARA) |
| L8 | Neg. Meniscus (2× Asph) | Aspherical mold glass (592/670, FCD505 class) |
| L9 | Biconvex Positive | Lanthanum crown (755/523) |
| L10 | Negative Meniscus | Dense flint (855/252) |
| L11 | Biconvex Positive | TAFD65 (Hoya) |
| L12 | Biconvex Positive | Ultra-dispersive flint (946/180) |
| L13 | Biconcave Negative | S-TIM22 (OHARA) |
| L14 | Neg. Meniscus (1× Asph) | S-TIM28 (OHARA) |
Detailed analysis available in the interactive viewer above.