DE 1,022,027 B — Hiroshi Ito
| 100mm |
| f/3.5 |
| 5 elements / 4 groups |
| Leica thread mount |
| 135 full-frame |
Unit focus. The patent gives the infinity prescription only; close focus is modeled by increasing BFD from 48.951 mm to 61.682 mm for Canon's 1 m close-focus specification.
| Element | Type | Glass |
|---|---|---|
| L11 | Biconvex Positive | SK10 / S-BSM10 / E-BACD10 class (623/569) |
| L12 | Biconcave Negative | F2 / S-TIM2 class (620/363) |
| L2 | Positive Meniscus | SK14 / S-BSM14 / BACD14 class (603/607) |
| L3 | Biconcave Negative | CF2 (HOYA catalog-equivalent; production supplier unspecified) |
| L4 | Biconvex Positive | BaF8 / E-BAF8 / K-BaF8 class (624/471) |