US 2020/0142167 A1 EXAMPLE 1 — CANON / 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-FD15 type (923/209) |
| L7 | Biconcave Negative | S-LAH66 type (773/496) |
| L8 | Biconvex Positive | S-TIH14 (OHARA) |
| L9 | Plano-Convex Positive | 581408 - barium crown (patent nd=1.58144, vd=40.8) |
| L10 | Plano-Convex Negative | 001291 - ultra-high-index dense flint (patent nd=2.00100, vd=29.1) |
| L11 | Negative Meniscus | 001255 - ultra-high-index dense flint (patent nd=2.00069, vd=25.5) |
| L12 | Biconvex Positive | S-LAM3 type (720/437) |
| L13 | Negative Meniscus | 001291 - ultra-high-index dense flint (patent nd=2.00100, vd=29.1) |
| L14 | Pos. Meniscus (2× Asph) | 531559 - moldable barium light crown (patent nd=1.53110, vd=55.9) |
| L15 | Biconcave Negative | S-TIH53W type (855/248) |
| L16 | Biconvex Positive | Unmatched (593686 borosilicate crown; catalog S-BSM81 does not round-trip patent nd=1.59282, vd=68.6) |
| L17 | Biconvex Positive | S-FPL51 type (497/815) |
| L18 | Positive Meniscus | S-TIH10 type (805/254) |
| L19 | Negative Meniscus | S-BSM18 (OHARA) |
| L20 | Biconcave Negative | S-LAH60 type (835/427) |
| L21 | Biconvex Positive | S-TIH53 (OHARA) |
Detailed analysis available in the interactive viewer above.