US 4,732,459 A, Example 4 — Kiyoshi Hayashi
| 11 ELEMENTS / 8 GROUPS |
| f = 300.0007 mm |
| F/2.0 |
| 21.0 mm INTERNAL FOCUS TRAVEL |
PUBLISHED internal focus: the complete negative G2 group translates 21.0 mm toward the image. Source D8 grows 102.701→123.701 mm while source D13 shrinks 28.388→7.388 mm; the inferred stop is fixed 1.500 mm ahead of G3, so authored D13→STO is 26.888→5.888 mm. Patent β=-0.089; direct paraxial trace gives β=-0.086422.
| Element | Type | Glass |
|---|---|---|
| L1 | Biconvex Positive | J-FKH1 catalog-equivalent coefficient proxy (patent 498823; production supplier unspecified) |
| L2 | Biconvex Positive | J-FKH1 catalog-equivalent coefficient proxy (patent 498823; production supplier unspecified) |
| L3 | Biconcave Negative | J-LAF7 catalog-equivalent coefficient proxy (patent 750352; production supplier unspecified) |
| L4 | Positive Meniscus | J-FKH1 catalog-equivalent coefficient proxy (patent 498823; production supplier unspecified) |
| L5 | Biconvex Positive | J-LAFH3 catalog-equivalent coefficient proxy (patent 795286; production supplier unspecified) |
| L6 | Biconcave Negative | KF3 catalog-equivalent coefficient proxy (patent 515546; production supplier unspecified) |
| L7 | Biconcave Negative | FK3 catalog-equivalent coefficient proxy (patent 465658; production supplier unspecified) |
| L8 | Biconcave Negative | S-TIM28 catalog-equivalent coefficient proxy (patent 689311; production supplier unspecified) |
| L9 | Biconvex Positive | H-LaK6A catalog-equivalent coefficient proxy (patent 694538; production supplier unspecified) |
| L10 | Negative Meniscus | S-TIM35 catalog-equivalent coefficient proxy (patent 699301; production supplier unspecified) |
| L11 | Biconvex Positive | K-LaK14 catalog-equivalent coefficient proxy (patent 697556; production supplier unspecified) |