WO 2020/012638 A1 EXAMPLE 8 — NIKON / KOMATSUBARA, UMEDA
| 9 ELEMENTS / 7 GROUPS |
| f = 16.46–48.50 mm |
| F/3.56–6.36 |
| 2ω ≈ 84.7–31.8° |
| 5 ASPHERICAL SURFACES |
Inner focus via G3 (L31, single biconcave dual-asphere). G3 moves image-ward for close focus. Close-focus gaps are inferred from paraxial conjugate solves because the patent publishes infinity zoom spacings only. Production MFD: 0.25 m @ 16 mm, 0.20 m @ 24 mm, 0.23 m @ 35 mm, 0.30 m @ 50 mm. STM drive.
| Element | Type | Glass |
|---|---|---|
| L11b | Neg. Meniscus (hybrid substrate) | S-LAH55 (OHARA, 835427) |
| L11r | Thin asph. resin layer (1× Asph) | UV-curable optical resin |
| L12 | Positive Meniscus | S-NPH2 (OHARA) |
| L21 | Neg. Meniscus (1× Asph) | 834373 - dense lanthanum flint (M-NBFD10 code match; patent nd=1.83441, vd=37.28) |
| L22 | Positive Meniscus | J-LASKH2 (Hikari, 755523) |
| L23 | Negative Meniscus | S-LAH98 (OHARA) |
| L24 | Biconvex Positive | S-FPL51 / FCD1 class (ED fluorophosphate, νd = 81.6) |
| L25 | Neg. Meniscus (1× Asph) | Q-LASFPH3S (Hikari, 795453) |
| L31 | Biconcave Negative (2× Asph) | 801455 - dense lanthanum flint (M-TAF31 code match; patent nd=1.80139, vd=45.46) |
| L41 | Pos. Meniscus (concave to object) | S-LAH98 (OHARA) |
Detailed analysis available in the interactive viewer above.