US 4,793,698, Example 1 — Hiroyuki Hirano
| 8 ELEMENTS / 7 GROUPS |
| DESIGN f = 135 mm |
| DESIGN F/2.8 |
| ALL SPHERICAL |
| PATENT f = 100 SCALED × 1.35 |
PUBLISHED infinity and 1/4-magnification gaps. Units 20 and 30 move toward the image, by 24.78 mm and 14.87 mm, while units 10 and 40 and the iris stay fixed. At the printed 1/4 state the object-to-image distance computes to 725 mm, about 3.6 % over the retail 0.7 m minimum focus.
| Element | Type | Glass |
|---|---|---|
| 12 | Positive Meniscus | S-FSL5 (OHARA catalog equivalent; production supplier unspecified) |
| 14 | Positive Meniscus | S-BAL35 (OHARA catalog equivalent; production supplier unspecified) |
| 16 | Positive Meniscus | S-LAL8 (OHARA catalog equivalent; production supplier unspecified) |
| 18 | Negative Meniscus | S-TIH14 (OHARA, SF14 class; patent prints νd 27.5 where this index is 26.5) |
| 24 | Negative Meniscus | S-LAH66 (OHARA catalog equivalent; production supplier unspecified) |
| 22 | Positive Meniscus | S-TIH13 (OHARA catalog equivalent; production supplier unspecified) |
| 32 | Negative Meniscus | S-BSL7 (OHARA catalog equivalent; production supplier unspecified) |
| 42 | Biconvex Positive | LLF6 (SUMITA catalog equivalent; production supplier unspecified) |