US 3,748,022, sole example — Akira Tajima
| 35mm f/2 |
| 9 elements / 8 groups |
| Floating focus |
| FD mount |
Unit focus with floating correction — whole lens shifts forward while air space D10 (II₁–II₂) closes in proportion
| Element | Type | Glass |
|---|---|---|
| L1 | Positive Meniscus | S-LAM59 (OHARA catalog equivalent for patent coordinate; production supplier unspecified) |
| L2 | Negative Meniscus | S-BSL7 (OHARA catalog equivalent for patent coordinate; production supplier unspecified) |
| L3 | Negative Meniscus | BASF7 (Sumita coefficient-backed equivalent), 702411 |
| L4 | Positive Meniscus | S-LAM51 (OHARA) |
| L5 | Positive Meniscus | 774492 — dense lanthanum crown (no catalog equivalent; nd=1.7737, νd=49.2) |
| L6 | Biconcave Negative | S-TIH14 (OHARA catalog equivalent for patent coordinate; production supplier unspecified) |
| L7 | Biconcave Negative | S-TIH6 (OHARA catalog equivalent for patent coordinate; production supplier unspecified) |
| L8 | Biconvex Positive | 774492 — dense lanthanum crown (no catalog equivalent; nd=1.7737, νd=49.2) |
| L9 | Biconvex Positive | S-LAH53 (OHARA catalog equivalent for patent coordinate; production supplier unspecified) |