US 5,745,306 A — Susumu Sato
| 10 ELEMENTS / 7 GROUPS |
| 600 mm f/4 (marketed) |
| EFL ≈ 587.793 mm (design) |
| F/4.08 DESIGN |
| 3 ED ELEMENTS |
| 135 FORMAT |
PUBLISHED inner focus: G2 translates imageward by 10.8634 mm from infinity to the patent R=6000 mm object-to-image state; d11 33.4177→44.2811 mm and d16 16.5738→5.7105 mm. This endpoint is not Nikon's marketed 5.4/5.6 m MFD.
| 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 | TAF3D catalog equivalent (patent 804465; production supplier unspecified) |
| L14a | Negative Meniscus (convex to object) | TAF3D catalog equivalent (patent 804465; production supplier unspecified) |
| L14b | Positive Meniscus (convex to object) | J-FKH1 catalog equivalent (patent 498825; production supplier unspecified) |
| L21 | Negative Meniscus (convex to object) | TAF4 catalog equivalent (patent 788475; production supplier unspecified) |
| L22a | Positive Meniscus (concave to object) | SF6 catalog equivalent (patent 805254; production supplier unspecified) |
| L22b | Biconcave Negative | S-BSM81 catalog equivalent (patent 640600; production supplier unspecified) |
| L3a | Biconvex Positive | J-PKH1 catalog equivalent (patent 519700; production supplier unspecified) |
| L3b | Negative Meniscus (concave to object) | E-LAFH2 catalog equivalent (patent 804339; production supplier unspecified) |