JP 1997-297263 A — Hisataro Shimada
| 7 ELEMENTS / 6 GROUPS |
| f = 54.99997 mm (DESIGN) |
| F/2.8 |
| 2ω = 64° |
| ALL-SPHERICAL |
NO_INTERNAL_RECONSTRUCTION — manufacturer literature describes floating-element focusing to 0.45 m, but JP 1997-297263 Example 1 publishes no focus-motion data. Only the published infinity-like state is modeled.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | BSL7 (legacy OHARA coordinate match; 516642) |
| L2 | Biconvex Positive | LAL8 (legacy OHARA coordinate match; 713538) |
| L3 | Negative Meniscus | BAM8 (legacy OHARA coordinate match; 624471) |
| L4 | Positive Meniscus | LAH52 (legacy OHARA coordinate match; 800422) |
| L5 | Biconcave Negative | BPH50 (legacy OHARA coordinate match; 740317) |
| L6 | Positive Meniscus | FPL51 (legacy OHARA coordinate match; 497816) |
| L7 | Positive Meniscus | LAL61 (legacy OHARA coordinate match; 741527) |