US 2022/0236544 A1 Example 10 - FUJIFILM / Nagami
| 14 elements / 10 groups |
| f = 20.60-33.99 mm design; 20-35 mm marketed |
| F/4 nominal; patent FNo. 4.08-4.11 |
| 2ω = 110.0°-74.6° |
| 8 aspherical surfaces; 4 ED-class elements |
Inner focus by entire G2 (L21-L22). Patent Table 29 gives beta=-0.1 focus spacings at wide and tele; middle close-focus spacing is interpolated for the viewer.
| Element | Type | Glass |
|---|---|---|
| L11 | Negative Meniscus | S-NPH3 (OHARA; 959/175 optical match) |
| L12 | Neg. Meniscus (2x Asph) | MP/MC-BACD12 (HOYA precision-molding class; 583/595) |
| L13 | Negative Meniscus ED | N-PK52A / FCD1 / S-FPL51 class (497/816 ED) |
| L14 | Positive Meniscus Dense Flint | S-TIH53-class dense flint (847/238; vendor uncertain) |
| L21 | Plano-Convex Positive | TAFD35 (HOYA; 911/353) |
| L22 | Weak Neg. Meniscus (2x Asph) | E-FD8 (HOYA, 689312 code) |
| L31 | Biconvex Positive | N-FK5 / S-FSL5 class (487/704) |
| L32 | Biconcave Negative | H-LaF6L / lanthanum flint class (757/477) |
| L33 | Plano-Convex ED | N-PK52A / FCD1 / S-FPL51 class (497/816 ED) |
| L34 | Biconvex Positive ED (2x Asph) | Unmatched (ED fluorophosphate, 496/813; near FCD1/S-FPL51 family) |
| L41 | Negative Meniscus Dense Flint | N-LASF46B / TAFD25 / S-LAH95 class (904/313) |
| L42 | Positive Meniscus ED | N-PK52A / FCD1 / S-FPL51 class (497/816 ED) |
| L43 | Negative Meniscus (2x Asph) | MP/MC-LAC130 (HOYA precision-molding class; 694/532) |
| L51 | Positive Meniscus Dense Lanthanum Flint | TAFD32 / H-ZLaF64 class (871/407) |
Detailed analysis available in the interactive viewer above.