US 5,640,277 A — Kouichi Ohshita
| 10 ELEMENTS / 9 GROUPS · PATENT CANDIDATE |
| f = 85.0 mm |
| F/1.43 (PATENT) |
| 2ω ≈ 28.6° (FIG. 5) |
| ALL SPHERICAL |
Inner focus — G2 (L4–L7, five elements) and the stop move 10.3438 mm objectward. The source beta=-0.1 station implies about 0.956 m object-to-image distance; G1, G3 and rear BF stay fixed.
| Element | Type | Glass |
|---|---|---|
| L1a | Positive Meniscus | S-PHM53 (OHARA, approximate coordinate counterpart) |
| L1b | Positive Meniscus | J-PSKH1 (Hikari, inferred coordinate counterpart) |
| L2 | Positive Meniscus | NBFD2 (HOYA catalog equivalent; production supplier unspecified; patent 796409) |
| L3 | Negative Meniscus | S-TIH1 (OHARA, inferred coordinate counterpart) |
| L4 | Positive Meniscus | NBFD3 (HOYA, inferred coordinate counterpart) |
| L5 | Biconcave Negative | S-TIM25 (OHARA, inferred coordinate counterpart) |
| L6a | Biconcave Negative | S-TIM28 (OHARA, inferred coordinate counterpart) |
| L6b | Biconvex Positive | TAFD32 (HOYA, inferred coordinate counterpart) |
| L7 | Biconvex Positive | N-LAF21 (Schott, inferred coordinate counterpart) |
| L8 | Positive Meniscus | 748523 — E-LAKH1 catalog equivalent (Hikari; production supplier unspecified) |