US 5,315,441 A — Kenji Hori, Wataru Tatsuno
| 11 ELEMENTS / 8 GROUPS |
| f = 28.6208 mm |
| F/1.41 |
| 2ω = 75.37° |
| 1 ASPHERICAL SURFACE |
Source 1:10 focus station corresponds to about 39.7 cm object-to-image. G1 stays fixed; G2 plus stop and G4 move 3.5248 mm objectward, G3 moves 3.8773 mm. Intermediate motion is interpolated.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | BSC7 / BK7 type (HOYA BSC7 nd=1.51680, νd=64.20) (inferred coordinate counterpart) |
| L2 | Biconvex Positive | S-LAH66 (OHARA) — near nd=1.77250/νd=49.62 (inferred coordinate counterpart) |
| L3 | Negative Meniscus | FK5 / S-FSL5 type (Schott FK5 nd=1.48749, νd=70.41) (inferred coordinate counterpart) |
| L4a | Positive Meniscus | J-PKH1 (Hikari, 519699) (inferred coordinate counterpart) |
| L4b | Biconcave Negative | KF3 (SUMITA catalog equivalent for patent coordinate; production supplier unspecified) (inferred coordinate counterpart) |
| L5 | Biconvex Positive | S-LAH65V (OHARA) — near nd=1.80400/νd=46.58 (inferred coordinate counterpart) |
| L6a | Positive Meniscus | 748523 — E-LAKH1 catalog equivalent (Hikari; production supplier unspecified) (inferred coordinate counterpart) |
| L6b | Negative Meniscus | Dense flint (near OHARA S-TIH4, nd=1.75520, νd=27.53) (inferred coordinate counterpart) |
| L7 | Pos. Meniscus (1× Asph) | S-LAH66 (OHARA) — same as L2 (inferred coordinate counterpart) |
| L8a | Biconvex Positive | S-LAH65V (OHARA) — same as L5 (inferred coordinate counterpart) |
| L8b | Negative Meniscus | J-SFH2 (Hikari coordinate match) (inferred coordinate counterpart) |