DE 2206106 A1 — Jihei Nakagawa
| 5 ELEMENTS / 5 GROUPS |
| f = 1000.10 mm |
| F/11 |
| 2ω = 2.5° |
| ALL-SPHERICAL |
Rack-and-pinion unit-focus model; the full optical assembly extends 36.70 mm from infinity to 30 m.
| Element | Type | Glass |
|---|---|---|
| L1 | Biconvex Positive | PCD4 class (618/634 dense phosphate crown; vendor uncertain) |
| L2 | Biconcave Negative | S-TIH4 (OHARA) |
| L3 | Biconvex Positive | S-TIH11 (OHARA) |
| L4 | Positive Meniscus | S-TIM35 (OHARA) |
| L5 | Plano-Concave Negative | PCD2 / PSK2 class (569/631 phosphate crown; vendor uncertain) |