US 2019/0302431 A1 — Daiki Kawamura
| 20 ELEMENTS / 13 GROUPS |
| 4 ASPHERICAL ELEMENTS / 8 ASPHERICAL SURFACES |
| PUBLISHED W/T + 500 mm FOCUS STATES |
PUBLISHED focus model: G4/Gf moves imageward from infinity to the patent 500 mm-from-image-plane state; DD[26] and DD[32] preserve their sum at each zoom endpoint. The production 0.25 m MFD is not reconstructed.
| Element | Type | Glass |
|---|---|---|
| L11 | Negative Meniscus | S-LAH89 (OHARA) class |
| L12 | Neg. Meniscus (2x Asph) | Unmatched (nd=1.69259, vd=53.07, theta_gF=0.54955) |
| L13 | Neg. Meniscus (2x Asph) | Q-LASFH58S (HIKARI) class |
| L14 | Biconcave Negative | S-FPL55 (OHARA) class |
| L15 | Positive Meniscus | S-LAH98 (OHARA) class |
| L21 | Biconvex Positive (2x Asph) | L-LAL13 (OHARA) class |
| L22 | Biconcave Negative | S-LAH97 (OHARA) class |
| L23 | Positive Meniscus | S-FPM2 (OHARA) class |
| L24 | Biconcave Negative | S-LAH59 (OHARA) class |
| L25 | Biconvex Positive | S-TIM22 (OHARA) class |
| L31 | Biconcave Negative | S-LAH59 (OHARA) class |
| L32 | Biconvex Positive | FCD505 (HOYA) class |
| L33 | Negative Meniscus | S-LAH89 (OHARA) class |
| L34 | Biconvex Positive | S-FPL55 (OHARA) class |
| L35 | Biconvex Positive | S-FPL55 (OHARA) class |
| L41 | Positive Meniscus (2x Asph) | 853406 class (spectrally unmatched to D-ZLaF85LS-25) |
| L42 | Plano-Concave Negative | S-LAH58 (OHARA) class |
| L43 | Biconvex Positive | S-FPL51 (OHARA) class |
| L44 | Biconcave Negative | H-ZLaF68N (CDGM) class |
| L51 | Biconvex Positive | FDS18 / FDS18-W (HOYA) class |