US 716,035 — Carl August Hans Harting
| 5 ELEMENTS / 3 GROUPS |
| f = 100 (normalized) |
| F/4.0 |
| 2ω ≈ 43.6° |
| ALL SPHERICAL |
Inferred unit focus — all groups and the stop move together by 12.72 mm. The modeled 1.0 m endpoint is object-to-image distance at 100 mm scale; no focus schedule is published. Intermediate distance labels are approximate.
| Element | Type | Glass |
|---|---|---|
| La | Negative Meniscus | Unmatched Glass I (patent nD; estimated Abbe 42; supplier unspecified) |
| Lb | Biconvex Positive | Unmatched Glass II (patent nD; estimated Abbe 57; supplier unspecified) |
| Lc | Biconcave Negative | Unmatched Glass I (patent nD; estimated Abbe 42; supplier unspecified) |
| Lb' | Biconvex Positive | Unmatched Glass II (patent nD; estimated Abbe 57; supplier unspecified) |
| La' | Negative Meniscus | Unmatched Glass I (patent nD; estimated Abbe 42; supplier unspecified) |