US 2,746,351 A, Table 2 — Albrecht Wilhelm Tronnier
| 5 ELEMENTS / 4 GROUPS |
| DESIGN f = 35 mm |
| DESIGN F/3.4 |
| ALL SPHERICAL |
Static model at infinity. The patent prints no close-focus spacing. Voigtländer's Prominent lens booklet says the Skoparon couples automatically to the camera's built-in rangefinder, and its distance scale runs to 0.7 m. The booklet does not say which part moves to focus, so no focus movement is drawn.
| Element | Type | Glass |
|---|---|---|
| L1 | Negative Meniscus | Unmatched (patent nd 1.46522, νd 65.2; the nearest catalog row, FK3, is 0.57 off in νd) |
| L2 | Plano-Convex Positive | Unmatched (patent nd 1.65770, νd 51.2; the nearest catalog rows, N-SSK5 and S-BSM25, are 0.32 off in νd) |
| L3 | Biconcave Negative | Unmatched (patent nd 1.60266, νd 38.4; the nearest catalog rows, F5 and E-F5, are 0.37 off in νd) |
| L4 | Biconcave Negative | S-BAM3 (OHARA; nearest catalog row to patent nd 1.58360, νd 46.2; production glass unspecified) |
| L5 | Biconvex Positive | LAC13 (HOYA catalog equivalent; production supplier unspecified) |