JP 2017-223778 A, Example 1 — Noriyuki Ogasawara
| 21 ELEMENTS / 15 GROUPS |
| DESIGN f = 103.16–387.95 mm |
| DESIGN F/5.15–6.50 |
| ALL SPHERICAL |
| 4 SLD ELEMENTS |
Inner focus. The patent prints infinity spacings only and states that G4 alone moves toward the object (claim 3, ¶0076). Here G4 moves that way, D25 shorter and D32 longer by the same amount, with G2 and the image plane fixed, to Sigma's 1.6 m minimum focus distance measured from the image plane. The travel is derived, not printed: 1.63 mm at the wide position, 4.05 mm at the middle position and 12.45 mm at the tele position. Finite MTF is unavailable because the patent publishes no finite conjugate. The stabilizer stays centred.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | TAFD5F (HOYA catalog equivalent; production supplier unspecified) |
| L2 | Biconvex Positive | FCD1 (HOYA catalog equivalent; production supplier unspecified) |
| L3 | Biconvex Positive | FCD1 (HOYA catalog equivalent; production supplier unspecified) |
| L4 | Positive Meniscus | E-FD15 (HOYA catalog equivalent; production supplier unspecified) |
| L5 | Biconvex Positive | E-FEL1 (HOYA catalog equivalent; production supplier unspecified) |
| L6 | Biconcave Negative | TAFD5F (HOYA catalog equivalent; production supplier unspecified) |
| L7 | Biconcave Negative | TAC8 (HOYA catalog equivalent; production supplier unspecified) |
| L8 | Biconcave Negative | TAC8 (HOYA catalog equivalent; production supplier unspecified) |
| L9 | Positive Meniscus | S-NBH56 (OHARA catalog equivalent; production supplier unspecified) |
| L10 | Biconvex Positive | PCD51 (HOYA catalog equivalent; production supplier unspecified) |
| L11 | Biconvex Positive | PCD51 (HOYA catalog equivalent; production supplier unspecified) |
| L12 | Negative Meniscus | TAFD55 (HOYA catalog equivalent; production supplier unspecified) |
| L13 | Positive Meniscus | E-FD15 (HOYA catalog equivalent; production supplier unspecified) |
| L14 | Negative Meniscus | TAFD55 (HOYA catalog equivalent; production supplier unspecified) |
| L15 | Positive Meniscus | E-FD1L (HOYA catalog equivalent; production supplier unspecified) |
| L16 | Biconvex Positive | BACED5 (HOYA catalog equivalent; production supplier unspecified) |
| L17 | Biconcave Negative | TAFD45 (HOYA catalog equivalent; production supplier unspecified) |
| L18 | Biconvex Positive | FCD705 (HOYA catalog equivalent; production supplier unspecified) |
| L19 | Negative Meniscus | TAFD45 (HOYA catalog equivalent; production supplier unspecified) |
| L20 | Biconcave Negative | FCD1 (HOYA catalog equivalent; production supplier unspecified) |
| L21 | Biconvex Positive | S-NBH53 (OHARA catalog equivalent; production supplier unspecified) |