JP S50-132921 A, sole example — Yoshisato Fujioka
| 7 ELEMENTS / 6 GROUPS |
| 35mm f/2.8 |
| 64° |
| 0.3m MINIMUM FOCUS |
| ALL SPHERICAL |
Unit focus to 0.3 m, reconstructed: the whole lens moves forward 5.88 mm and the back focus grows from 38.045 mm to 43.920 mm. The patent and the FX-1 manual do not state the focusing mechanism. Finite-conjugate MTF is unavailable.
| Element | Type | Glass |
|---|---|---|
| L1 | Meniscus Negative | BACD13 (HOYA, coordinate equivalent) |
| L2 | Biconcave Negative | N-SK11 (SCHOTT catalog equivalent; production supplier unspecified) |
| L3 | Biconvex Positive | LAC8 (HOYA, coordinate equivalent) |
| L4 | Biconvex Positive | LAC13 (HOYA, coordinate equivalent) |
| L5 | Biconcave Negative | SF1 (SCHOTT catalog equivalent; production supplier unspecified) |
| L6 | Meniscus Positive | LAC8 (HOYA, coordinate equivalent) |
| L7 | Meniscus Positive | LACL1 (HOYA, coordinate equivalent) |