US 2020/0166735 A1, Example 11 — Daiki Kawamura, Taiga Noda
| 16 ELEMENTS / 12 GROUPS |
| f = 16.5–77.8 mm |
| F/4 |
| 2ω = 87.2°–19.8° |
| 8 ASPHERICAL SURFACES (4 ELEMENTS) |
| OIS: L34 |
Inner focus: the G4 cemented doublet alone moves toward the image for closer subjects (patent ¶0077). The patent publishes no close-focus spacings, so focus travel is not modelled.
| Element | Type | Glass |
|---|---|---|
| L11 | Negative Meniscus | S-TIH53 (OHARA, 847/238 dense short flint) |
| L12 | Positive Meniscus | TAC8 (HOYA, 729/547 lanthanum crown; OHARA S-LAL18 equivalent) |
| L13 | Positive Meniscus | S-LAL14 (OHARA, 697/555 lanthanum crown) |
| L21 | Neg. Meniscus (2× Asph) | 808409 - PGM lanthanum dense flint (MC-NBFD135 code match; patent nd=1.80780, vd=40.89) |
| L22 | Negative Meniscus | S-PHM52 (OHARA, 618/634 light phosphate crown) |
| L23 | Biconvex Positive | E-FDS1 (HOYA, 923/209 dense flint) |
| L24 | Negative Meniscus | S-TIH53 (OHARA, 847/238 dense short flint) |
| L31 | Pos. Biconvex (2× Asph) | M-FD80 (HOYA, 689/312 moldable dense flint) |
| L32 | Negative Meniscus | S-TIH53 (OHARA, 847/238 dense short flint) |
| L33 | Positive Meniscus | S-PHM52 (OHARA, 618/634 light phosphate crown) |
| L34 | Pos. Biconvex (2× Asph) | M-FCD1 (HOYA, 497/816 moldable fluorophosphate ED glass) |
| L41 | Biconvex Positive | S-NPH5 (OHARA, 859/227 dense flint) |
| L42 | Biconcave Negative | S-LAH63 (OHARA, 804/396 lanthanum flint) |
| L51 | Biconvex Positive | N-BK7 (SCHOTT, 517/642 borosilicate crown; OHARA S-BSL7 equivalent) |
| L52 | Plano-Concave Negative | LAC13 (HOYA, 694/533 lanthanum crown) |
| L53 | Pos. Meniscus (2× Asph) | M-BACD12 (HOYA, 583/595 moldable barium crown) |