US 5,745,306 A — Susumu Sato
| 11 ELEMENTS / 9 GROUPS |
| 3 ED ELEMENTS |
| PATENT F=490.0 mm; EFL≈489.961 mm |
| DESIGN f/4.08 |
| 2ω≈5.05° |
| INTERNAL FOCUS (SOURCE-CORRECTED) |
CONSTRAINED_RECONSTRUCTION: the published G2 mechanism is retained, but the printed close d16=18.4240 mm is corrected to 8.4240 mm under the patent's 10.84 mm single-group travel and R=5000 mm constraints; G2 moves 10.8363 mm toward the image from infinity to 5 m.
| Element | Type | Glass |
|---|---|---|
| L11 | Biconvex Positive | J-FKH1 catalog equivalent (patent 498825; production supplier unspecified) |
| L12 | Biconvex Positive | J-FKH1 catalog equivalent (patent 498825; production supplier unspecified) |
| L13 | Biconcave Negative | Unmatched (nd=1.802180, νd=44.69) |
| L14a | Negative Meniscus | J-SSK5 catalog equivalent (patent 658508; production supplier unspecified) |
| L14b | Positive Meniscus | J-FKH1 catalog equivalent (patent 498825; production supplier unspecified) |
| L21 | Biconcave Negative | 773495 class (M-TAF1 catalog-equivalent spectral proxy; production supplier unspecified) |
| L22a | Positive Meniscus | J-SF03 catalog equivalent (patent 847238; production supplier unspecified) |
| L22b | Biconcave Negative | J-PKH1 catalog equivalent (patent 519700; production supplier unspecified) |
| L3a | Biconvex Positive | J-PKH1 catalog equivalent (patent 519700; production supplier unspecified) |
| L3b | Negative Meniscus | NBFD3 catalog equivalent (patent 805396; production supplier unspecified) |
| L3c | Positive Meniscus | J-PKH1 catalog equivalent (patent 519700; production supplier unspecified) |