US 2,828,671, sole example — Saburo Murakami
| 9 elements / 6 groups |
| Modified double-Gauss |
| All-spherical |
| Scaled 0.5× from f = 100 patent |
Unit focus — entire lens translates; only back focal distance changes (extension calculated)
| Element | Type | Glass |
|---|---|---|
| L1 | Positive Meniscus | K-SK7 (Sumita) catalog equivalent (patent 607595; production supplier unspecified) |
| L2 | Positive Meniscus | K-SK7 (Sumita) catalog equivalent (patent 607595; production supplier unspecified) |
| L3 | Positive Meniscus | S-LAM3 catalog equivalent (patent 717479; production supplier unspecified) |
| L4 | Negative Meniscus | S-FTM16 (OHARA) catalog equivalent (patent 593354; production supplier unspecified) |
| L5 | Biconcave Negative | S-TIM22 (OHARA) nearest catalog neighbour (patent 648338 at nd 1.6483; catalog nd 1.64769) |
| L6 | Biconvex Positive | S-LAM3 catalog equivalent (patent 717479; production supplier unspecified) |
| L7 | Plano-Convex | S-LAM3 catalog equivalent (patent 717479; production supplier unspecified) |
| L8 | Negative Meniscus | E-F1 (HOYA) catalog equivalent (patent 626356; production supplier unspecified) |
| L9 | Positive Meniscus | K-SK18 (Sumita) catalog equivalent (patent 639555; production supplier unspecified) |