US 2015/0212302 A1, Example 3 — Takashi Suzuki
| 11 ELEMENTS / 8 GROUPS |
| f = 56.98 mm |
| F/1.25 |
| 2ω = 28.0° |
| 2 ASPHERICAL SURFACES |
Inner focus — L21 through L24 move toward the object; G1, stop and L25 fixed. Close-focus travel (6.90 mm to 0.7 m) is calculated; the patent publishes none.
| Element | Type | Glass |
|---|---|---|
| L11 | Positive Meniscus | S-FSL5 (OHARA) |
| L12 | Positive Meniscus | S-FPL51 (OHARA) — ED |
| L13 | Positive Meniscus | S-FPL51 (OHARA) — ED |
| L14 | Positive Meniscus | S-LAH58 (OHARA) |
| L15 | Negative Meniscus | FF8 (HOYA fluor flint) |
| L16 | Negative Meniscus | S-NBH52 (OHARA) |
| L21 | Biconcave Neg. (2× Asph) | L-BAL42 (OHARA) — PGM |
| L22 | Positive Meniscus | S-LAH58 (OHARA) |
| L23 | Biconcave Negative | H-ZF39 (CDGM catalog equivalent; production supplier unspecified) |
| L24 | Biconvex Positive | S-LAH58 (OHARA) |
| L25 | Biconvex Positive | S-FSL5 (OHARA) |