JP2021-47297A EXAMPLE 1 — CANON / TAKI, MORI, NAKAHARA
| 17 ELEMENTS / 13 GROUPS |
| f ≈ 100.8 mm |
| F/2.92 |
| 2ω ≈ 24.2° |
| ALL SPHERICAL |
| SA CONTROL |
Dual floating focus — groups L2 and L4 translate independently toward image via dual Nano USM linear motors. Same groups provide SA (spherical aberration) control via differential displacement at any focus position.
| Element | Type | Glass |
|---|---|---|
| L1 | Biconcave Negative | S-LAH55V (OHARA) |
| L2 | Biconvex Positive | S-TIH14 (OHARA) |
| L3 | Biconvex Positive | S-LAH55V (OHARA) |
| L4 | Biconvex Positive | S-FSL5 (OHARA) |
| L5 | Biconcave Negative | S-TIH53 (OHARA) |
| L6 | Negative Meniscus | S-LAH99 (OHARA) |
| L7 | Biconvex Positive | S-LAH66 (OHARA) |
| L8 | Biconvex Positive | S-LAL18 (OHARA) |
| L9 | Negative Meniscus | S-LAL59 (OHARA) |
| L10 | Biconcave Negative | S-LAH66 (OHARA) |
| L11 | Positive Meniscus | 946180 — ultra-high-index dense flint (nd=1.94595, νd=18.0) |
| L12 | Plano-Convex Positive | 764485 — Hikari/CDGM lanthanum flint class (nd=1.76385, νd=48.5) |
| L13 | Biconvex Positive | S-LAL18 (OHARA) |
| L14 | Negative Meniscus | TAFD40 (HOYA) |
| L15 | Biconcave Negative | S-LAH55V (OHARA) |
| L16 | Positive Meniscus | S-TIM25 (OHARA) |
| L17 | Biconcave Negative | S-BAL35 (OHARA) |
Detailed analysis available in the interactive viewer above.