JP 2020-012952 A Example 1 — Sigma / Yamanaka
| 16 ELEMENTS / 12 GROUPS |
| f ≈ 41.2 mm |
| F/1.4 |
| 2ω ≈ 55.9° |
| 2 ASPHERICAL SURFACES |
Floating inner focus. G2 and G3 move toward the object with differential travel (G3 moves ~1 mm farther than G2). G1 fixed; stop attached to G3. HSM ring-type ultrasonic drive.
| Element | Type | Glass |
|---|---|---|
| L1 | Positive Meniscus | S-LAH66 (OHARA) |
| L2 | Negative Meniscus | FCD100 (HOYA) |
| L3 | Negative Meniscus | FCD100 (HOYA) |
| L4 | Biconcave Negative | E-FD2 (HOYA) |
| L5 | Biconvex Positive | S-LAH55V (OHARA) |
| L6 | Positive Meniscus | M-FCD500 (HOYA) |
| L7 | Biconcave Negative | S-TIM5 (OHARA) |
| L8 | Biconvex Positive | S-LAH66 (OHARA) |
| L9 | Biconvex Positive | S-NPH2 (OHARA) |
| L10 | Biconvex Positive | PCD51 (HOYA) |
| L11 | Biconcave Negative | E-FL5 (HOYA) |
| L12 | Biconvex Positive | FCD100 (HOYA) |
| L13 | Biconcave Negative | E-FD2 (HOYA) |
| L14 | Negative Meniscus | E-F1 (HOYA) |
| L15 | Biconvex Positive | PCD51 (HOYA) |
| L16 | Pos. Meniscus (2× Asph) | S-NBH56 (OHARA) |
Detailed analysis available in the interactive viewer above.