US 2020/0142167 A1 — Shohei Kikuchi
| 21 ELEMENTS / 15 GROUPS |
| f ≈ 24.7–232.8 mm |
| F/4.12–6.41 |
| 2ω ≈ 75.1–10.6° |
| 2 ASPHERICAL SURFACES (1 ELEMENT) |
| 2 UD (ULTRA-LOW DISPERSION) ELEMENTS |
Rear inner focus via unit 5 (L18+L19 cemented doublet). L5 moves toward image for close focus. Canon Nano USM actuator.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | S-LAH95 type (903/313) |
| L2 | Biconvex Positive | S-FPL51 type (497/815) |
| L3 | Positive Meniscus | S-PHM52 type (618/634) |
| L4 | Negative Meniscus | S-LAH89 (OHARA) |
| L5 | Biconcave Negative | S-LAH89 (OHARA) |
| L6 | Biconvex Positive | E-FDS1 (HOYA) |
| L7 | Biconcave Negative | S-LAH66 type (773/496) |
| L8 | Biconvex Positive | S-TIH14 (OHARA) |
| L9 | Plano-Convex Positive | PBL25 (OHARA catalog equivalent; patent code 581408, vendor unspecified) |
| L10 | Plano-Convex Negative | S-LAH99 (OHARA catalog equivalent; patent code 001291, vendor unspecified) |
| L11 | Negative Meniscus | TAFD40 (HOYA catalog equivalent; patent code 001255, vendor unspecified) |
| L12 | Biconvex Positive | S-LAM52 (OHARA; 720/437) |
| L13 | Negative Meniscus | S-LAH99 (OHARA catalog equivalent; patent code 001291, vendor unspecified) |
| L14 | Pos. Meniscus (2× Asph) | 531559 - moldable barium light crown (patent nd=1.53110, vd=55.9) |
| L15 | Biconcave Negative | S-NBH56 (OHARA) |
| L16 | Biconvex Positive | FCD515 (HOYA catalog-equivalent; production supplier unspecified) |
| L17 | Biconvex Positive | S-FPL51 type (497/815) |
| L18 | Positive Meniscus | S-TIH6 (OHARA) |
| L19 | Negative Meniscus | S-BSM18 (OHARA) |
| L20 | Biconcave Negative | S-LAH55 (OHARA; exact 835427 coordinate match, patent vendor unspecified) |
| L21 | Biconvex Positive | S-TIH53 (OHARA) |