US 3,506,339 — Tomokazu Kazamaki
| 7 ELEMENTS / 7 GROUPS |
| f = 28.000 mm |
| F/3.5 |
| 2ω = 74.5° |
| ALL-SPHERICAL |
Inferred unit-focus model: the complete seven-element assembly translates rigidly because the patent publishes no variable internal spacing.
| Element | Type | Glass |
|---|---|---|
| L1 | Positive Meniscus | S-BAH10 (OHARA equivalent; patent supplier not specified) |
| L2 | Negative Meniscus | S-BSM16 (OHARA equivalent; patent supplier not specified) |
| L3 | Positive Meniscus (Near-Zero Power) | N-LAK7 (SCHOTT equivalent; patent supplier not specified) |
| L4 | Biconvex Positive | S-LAM58 (OHARA exact 720/420 match; patent supplier not specified) |
| L5 | Biconcave Negative | E-FD15 (HOYA equivalent; patent supplier not specified) |
| L6 | Positive Meniscus | S-BSM16 (OHARA equivalent; patent supplier not specified) |
| L7 | Positive Meniscus | S-BSM16 (OHARA equivalent; patent supplier not specified) |