US 3,827,781, sole example — Yoshitsugi Ikeda
| 6 ELEMENTS / 4 GROUPS |
| DESIGN f = 600.0 mm |
| DESIGN F/6 (SOLD AS F/6.5) |
| ALL SPHERICAL |
Rack-and-pinion unit focus; the whole optical assembly extends 39.26 mm from infinity to 11 m (paraxial solution).
| Element | Type | Glass |
|---|---|---|
| L1 | Biconvex Positive | S-FSL5 (OHARA) |
| L2 | Biconcave Negative | NBFD3 (HOYA) |
| L3 | Biconvex Positive | S-FSL5 (OHARA) |
| L4 | Biconcave Negative | BPM4 (OHARA) |
| L5 | Biconcave Negative | J-LAK8 (HIKARI) |
| L6 | Biconvex Positive | S-TIM35 (OHARA) |