VOIGTLÄNDER ULTRON 50mm f/2 — Interactive Lens Diagram

Home / Lenses / Voigtländer / VOIGTLÄNDER ULTRON 50mm f/2VOIGTLÄNDER ULTRON 50mm f/2US 2,627,204 EXAMPLE II — VOIGTLÄNDER / A. W. TRONNIER
6 ELEMENTS / 5 GROUPS
f ≈ 50.0 mm
F/2.0
2ω ≈ 46.8° (35mm)
ALL SPHERICAL
Focus MechanismUnit focus — entire lens translates via body-mounted helicoid (Voigtländer Prominent).
Optical Elements (6)ElementTypeGlass
L1Positive MeniscusSK16 type (dense barium crown)
L2Positive MeniscusHigh-index crown (SSK/LaK type — possibly La₂O₃ or ThO₂ formulation)
L3Negative MeniscusSF2 type (dense flint)
L4Biconcave NegativeF/BaF type (barium flint)
L5Biconvex PositiveLaK9 type (high-index crown — possibly La₂O₃ or ThO₂ formulation)
L6Biconvex PositiveLaF type (high-index lanthanum flint or thorium flint)
AnalysisDetailed analysis available in the interactive viewer above.

Element	Type	Glass
L1	Positive Meniscus	SK16 type (dense barium crown)
L2	Positive Meniscus	High-index crown (SSK/LaK type — possibly La₂O₃ or ThO₂ formulation)
L3	Negative Meniscus	SF2 type (dense flint)
L4	Biconcave Negative	F/BaF type (barium flint)
L5	Biconvex Positive	LaK9 type (high-index crown — possibly La₂O₃ or ThO₂ formulation)
L6	Biconvex Positive	LaF type (high-index lanthanum flint or thorium flint)