US 2025/0271647 A1, Embodiment 2 — Stefan Roth
| 10 ELEMENTS / 5 GROUPS |
| DESIGN f = 35 mm (PRINTED TABLE 34.75 mm) |
| DESIGN F/1.24 |
| 3 ASPHERICAL SURFACES / 3 ELEMENTS |
| INFINITY FOCUS ONLY |
Infinity focus only. To focus closer, the front group VG, the stop and the middle group MG move together toward the object while the rear group HG (L8–L10) floats, moving the same way by a smaller amount (¶0044); the gaps after surfaces 11 and 16 vary. The patent prints only the infinity spacings, so no close-focus state is modeled. Leica specifies 0.5 m minimum focus and 1:11.6 maximum magnification.
| Element | Type | Glass |
|---|---|---|
| L1 | Biconcave Negative | Unmatched (patent ne=1.608, νe=38; supplier not disclosed) |
| L2 | Biconvex Positive | Unmatched (patent ne=2.007, νe=28; supplier not disclosed) |
| L3 | Biconvex Positive (1× Asph) | Unmatched (patent ne=1.743, νe=48; supplier not disclosed) |
| L4 | Biconcave Negative | Unmatched (patent ne=1.760, νe=28; supplier not disclosed) |
| L5 | Plano-convex Positive | Unmatched (patent ne=1.890, νe=40; supplier not disclosed) |
| L6 | Biconcave Negative | Unmatched (patent ne=1.732, νe=29; supplier not disclosed) |
| L7 | Biconvex Positive (1× Asph) | Unmatched (patent ne=1.743, νe=48; supplier not disclosed) |
| L8 | Biconvex Positive | Unmatched (patent ne=1.945, νe=33; supplier not disclosed) |
| L9 | Biconcave Negative | Unmatched (patent ne=1.644, νe=34; supplier not disclosed) |
| L10 | Negative Meniscus (1× Asph) | Unmatched (patent ne=1.918, νe=27; supplier not disclosed) |