US 2,730,017 A, Example 1 — Albrecht Wilhelm Tronnier
| 6 ELEMENTS / 4 GROUPS |
| DESIGN f = 100 mm |
| DESIGN F/4.5 |
| ALL SPHERICAL |
Static model: the patent tabulates only the infinity state and the Dynaron's internal focusing motion is not published, so no focus travel is modeled. Once mounted, the lens couples to the Prominent's rangefinder and is focused with the camera's rangefinder knob. The 0.9 m close-focus value is where the lens's green meter scale begins in Voigtländer's Prominent lens booklet.
| Element | Type | Glass |
|---|---|---|
| L1 | Biconvex Positive | SK5 (SUMITA; nearest catalog row to patent nd 1.58987, νd 61.2; production glass unspecified) |
| L2 | Biconcave Negative | BASF8 (SUMITA; nearest catalog row to patent nd 1.72381, νd 38.0; production glass unspecified) |
| L3 | Negative Meniscus | BASF8 (SUMITA; nearest catalog row to patent nd 1.72381, νd 38.0; production glass unspecified) |
| L4 | Biconvex Positive | E-BAF8 (Hikari catalog equivalent; production supplier unspecified) |
| L5 | Biconcave Negative | LF5 (Schott; nearest catalog row to patent nd 1.58192, νd 40.8; production glass unspecified) |
| L6 | Biconvex Positive | SF4 (Schott catalog equivalent; production supplier unspecified) |