JP 2020-154139 A, Numerical Example 1 — Masahiro Imamura, Toyonori Kon
| 16 ELEMENTS / 11 GROUPS |
| DESIGN f = 12.36-196.04 mm |
| DESIGN F/3.60-6.47 |
| 4 ASPHERICAL SURFACES / 3 ELEMENTS |
| INFINITY FOCUS ONLY |
Infinity focus only. The patent tabulates infinity states only and identifies G4, the cemented negative doublet, as the focusing group (¶0081); no G4 focus travel is printed, so none is modelled and the focus control stays at infinity. The 0.22 m figure is the maker's wide-end minimum focus distance (0.70 m at the tele end), kept as metadata, not a modelled conjugate.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | J-LASFH17 (HIKARI catalog equivalent; production supplier unspecified) |
| L2 | Positive Meniscus | S-FPL53 (OHARA catalog equivalent; production supplier unspecified) |
| L3 | Positive Meniscus | FCD515 (HOYA catalog equivalent; production supplier unspecified) |
| L4 | Negative Meniscus | S-LAH58 (OHARA catalog equivalent; production supplier unspecified) |
| L5 | Biconcave Negative (Aspherical) | Unmatched (1.80280, 40.55) |
| L6 | Biconvex Positive | S-NPH1 (OHARA catalog equivalent; production supplier unspecified) |
| L7 | Biconcave Negative | S-LAH58 (OHARA catalog equivalent; production supplier unspecified) |
| L8 | Biconvex Positive | PBH21 (OHARA catalog equivalent; production supplier unspecified) |
| L9 | Biconvex Positive (Double Aspherical) | Unmatched (1.76960, 49.30) |
| L10 | Negative Meniscus | TAFD35 (HOYA catalog equivalent; production supplier unspecified) |
| L11 | Biconvex Positive | S-FPL53 (OHARA catalog equivalent; production supplier unspecified) |
| L12 | Positive Meniscus | S-BSL7 (OHARA catalog equivalent; production supplier unspecified) |
| L13 | Negative Meniscus | S-LAH55V (OHARA catalog equivalent; production supplier unspecified) |
| L14 | Positive Meniscus | S-TIM28 (OHARA catalog equivalent; production supplier unspecified) |
| L15 | Negative Meniscus (Aspherical) | Unmatched (1.80280, 40.55) |
| L16 | Biconvex Positive | S-NSL36 (OHARA catalog equivalent; production supplier unspecified) |