JP WO2020/157904 A1, Example 1 — Ayumu Makida, Tomoki Ito, Satoshi Miwa
| 19 ELEMENTS / 15 GROUPS |
| f = 24.7–194.0 mm (design) |
| F/4.12–6.50 (design) |
| 2ω ≈ 85.2°–12.3° |
| 3 ASPHERICAL SURFACES |
| 3 ED ELEMENTS |
Internal focus — G5 (cemented doublet L51+L52) translates toward the image (patent ¶0091). Table 1 G5 travel: 0.89 mm (W), 1.62 mm (M1), 4.31 mm (M2), 9.70 mm (T); near states are β = −0.062 to −0.284 at a calculated 0.49 m (W) to 0.69 m (T) object-to-image distance.
| Element | Type | Glass |
|---|---|---|
| L11 | Negative Meniscus | S-LAH95 (OHARA) |
| L12 | Biconvex Positive | J-PSKH1 (Hikari) |
| L13 | Positive Meniscus | J-PSKH1 (Hikari) |
| L21 | Negative Meniscus | 954323 — ultra-high-index lanthanum (S-LAH98 / TAFD45 family) |
| L22 | Biconcave Negative | N-LAK33B equiv. (175500/5233) |
| L23 | Biconvex Positive | PBH21 (OHARA; historical 923209) |
| L24 | Biconcave Negative | S-LAH59 (OHARA) |
| L31 | Biconvex Positive | 903357 — high-index lanthanum flint (patent nd=1.90265, νd=35.72) |
| L32 | Negative Meniscus | 001291 — ultra-high-index dense flint (patent nd=2.00100, νd=29.12) |
| L33 | Biconvex Positive | N-BALF4 equiv. (580539; patent nd=1.57957, vd=53.74) |
| L34 | Negative Meniscus | 954323 — ultra-high-index lanthanum (S-LAH98 / TAFD45 family) |
| L41 | Biconvex Positive | S-LAH55V equiv. (183481/4273) |
| L42 | Negative Meniscus | S-LAH95 (OHARA) |
| L43 | Negative Meniscus | 954323 — ultra-high-index lanthanum (S-LAH98 / TAFD45 family) |
| L44 | Biconvex Positive (1× Asph) | M-FCD1 (HOYA) catalog equivalent (patent nd=1.49710, νd=81.49; production supplier unspecified) |
| L51 | Biconvex Positive | S-TIH53 (OHARA) |
| L52 | Biconcave Negative (1× Asph) | M-TAFD305 (HOYA) catalog equivalent (patent nd=1.85135, νd=40.13; production supplier unspecified) |
| L61 | Neg. Meniscus (1× Asph) | M-TAFD51 catalog equivalent (patent nd=1.82080, νd=42.51; production supplier unspecified) |
| L62 | Biconvex Positive | J-KZFH6 (Hikari) — titanium flint (684376) |