US 2018/0074300 A1, Numerical Value Data 2 — Yuichi Gyoda, Kohei Kimura
| 17 ELEMENTS / 13 GROUPS |
| DESIGN f = 18.56–145.41 mm |
| DESIGN F/3.60–6.49 |
| 4 ASPHERICAL SURFACES / 2 ELEMENTS |
| 1 UD ELEMENT (MAKER) |
B6, the cemented L14/L15 pair, moves toward the image to focus closer (¶0074); D24 + D27 stays 13.79 mm and no other unit moves. The patent prints no finite-focus spacings for this example. The travel is calculated for Canon's closest distances, 0.25 m at 18–50 mm and 0.45 m at 150 mm (object to image), interpolated between the middle and tele rows: 0.81 mm at wide, 2.93 mm at the middle row and 7.14 mm at tele, where it gives 0.31×, Canon's stated maximum. Distance labels are estimates: the rounded infinity spacings of the printed wide and middle rows leave the lens focused at about 27 m and 68 m, so far-distance labels there read long (32 m at wide focuses at about 15 m).
| Element | Type | Glass |
|---|---|---|
| L1 | Meniscus Negative | TAFD35 (catalog equivalent; supplier unconfirmed) |
| L2 | Biconvex Positive | S-FPL51 (catalog equivalent; supplier unconfirmed) |
| L3 | Meniscus Positive | S-FPM2 (catalog equivalent; supplier unconfirmed) |
| L4 | Meniscus Negative | S-LAH98 (catalog equivalent; supplier unconfirmed) |
| L5 | Biconcave Negative | S-LAH66 (catalog equivalent; supplier unconfirmed) |
| L6 | Biconvex Positive | S-NPH53 (catalog equivalent; supplier unconfirmed) |
| L7 | Meniscus Negative | S-LAL14 (catalog equivalent; supplier unconfirmed) |
| L8 | Biconvex Positive (2× Asph) | L-BAL42 (catalog equivalent; supplier unconfirmed) |
| L9 | Meniscus Negative | S-LAH55 (catalog equivalent; supplier unconfirmed) |
| L10 | Meniscus Negative | TAFD25 (catalog equivalent; supplier unconfirmed) |
| L11 | Biconvex Positive | S-LAL14 (catalog equivalent; supplier unconfirmed) |
| L12 | Meniscus Positive | S-BSL7 (catalog equivalent; supplier unconfirmed) |
| L13 | Meniscus Negative | TAFD40 (catalog equivalent; supplier unconfirmed) |
| L14 | Biconvex Positive | S-NPH4 (Ohara; named in patent Table 1) |
| L15 | Biconcave Negative | S-NBH51 (Ohara; named in patent Table 1) |
| L16 | Meniscus Negative (2× Asph) | Unmatched (nd = 1.53160, νd = 55.8; material not identified) |
| L17 | Meniscus Positive | S-LAM55 (catalog equivalent; supplier unconfirmed) |