US 4,364,643 · Embodiment 3 (Momiyama, 1982)
| 7 elements / 6 groups |
| 46° field of view |
| MFD 0.5 m |
| 52 mm filter thread |
Unit focusing — entire optical assembly translates forward
| Element | Type | Glass |
|---|---|---|
| L1 | Positive Meniscus | Lanthanum special flint [788474] — OHARA LASF014 |
| L2 | Positive Meniscus | Lanthanum special flint [788474] — OHARA LASF014 (same as L1) |
| L3 | Negative Meniscus | Dense flint [667330] — OHARA SF19 |
| L4 | Negative Meniscus | Dense flint [805254] — OHARA SF6 |
| L5 | Positive Meniscus | Lanthanum special flint [773496] — OHARA LASF016 |
| L6 | Positive Meniscus | Lanthanum special flint (high-index) [863415] — OHARA LASF07 |
| L7 | Biconvex Positive | Lanthanum special flint [773496] — OHARA LASF016 (same as L5) |
Detailed analysis available in the interactive viewer above.