JP S38-26133 — Zenji Wakimoto
| 6 elements / 6 groups |
| f ≈ 28.0 mm |
| F/3.5 |
| 2ω = 75° patent field |
| all-spherical |
Unit focusing; all optical spacings remain fixed and the whole optical assembly translates forward.
| Element | Type | Glass |
|---|---|---|
| L1 | Positive Meniscus | SF5 (Schott equivalent) |
| L2 | Negative Meniscus | SK16 class (Hikari/Schott equivalent) |
| L3 | Biconvex Positive | K-SK18 (Sumita) / SK18 class |
| L4 | Biconcave Negative | SF5 (Schott equivalent) |
| L5 | Positive Meniscus | N-SSK5 (Schott) / SSK5 class |
| L6 | Biconvex Positive | BK7 class (Schott/Ohara/CDGM equivalent) |