JP H9-105860 — Kouichi Ohshita
| 4 ELEMENTS / 2 GROUPS |
| f = 390.0 mm design / 400 mm marketed |
| FNO = 8.13 patent / f/8 marketed |
| 2ω = 10.1° |
| ALL-SPHERICAL |
Unit focus; the whole optical assembly translates, modeled by increasing the final BFD gap from 174.594 mm to 211.603 mm at 4.5 m.
| Element | Type | Glass |
|---|---|---|
| L1 | Biconvex Positive | S-BSM10 (OHARA) |
| L2 | Negative Meniscus | E-LAF11 catalog equivalent (production supplier not established; patent 757316) |
| L3 | Biconvex Positive | S-TIM2 (OHARA) |
| L4 | Biconcave Negative | N-BK7 (Schott) / BSC7 class |