CARL ZEISS JENA SONNAR 50mm f/2 — Optical Cross-Section & Ray Tracing

Home / Lenses / Carl Zeiss Jena / CARL ZEISS JENA SONNAR 50mm f/2CARL ZEISS JENA SONNAR 50mm f/2US 1,998,704 EXAMPLE I — BERTELE / ZEISS IKON (1932) — SCALED 0.5× TO 50mm
6 ELEMENTS / 3 GROUPS
f ≈ 50.0 mm (scaled from 100mm patent)
F/2.0
2ω ≈ 46.8°
ALL SPHERICAL
Focus MechanismUnit focus — entire optical assembly translates via Contax body helicoid. No internal moving groups.
Optical Elements (6)ElementTypeGlass
L1Positive MeniscusSK16 (Schott dense crown)
L2Positive MeniscusUnmatched (vintage Schott/Jena barium light flint, patent nd=1.6711, νd=47.3)
L3Biconvex PositiveFK3 (Schott fluorite crown)
L4Biconcave NegativeN-SF8 / SF8 equivalent (Schott, patent nd=1.6890, νd=31.2)
L5Negative MeniscusUnmatched (vintage Schott/Jena BaK4-class barium crown, patent nd=1.5647, νd=55.8)
L6Biconvex PositiveUnmatched (vintage Schott/Jena barium light flint, patent nd=1.6711, νd=47.3)
AnalysisDetailed analysis available in the interactive viewer above.

Element	Type	Glass
L1	Positive Meniscus	SK16 (Schott dense crown)
L2	Positive Meniscus	Unmatched (vintage Schott/Jena barium light flint, patent nd=1.6711, νd=47.3)
L3	Biconvex Positive	FK3 (Schott fluorite crown)
L4	Biconcave Negative	N-SF8 / SF8 equivalent (Schott, patent nd=1.6890, νd=31.2)
L5	Negative Meniscus	Unmatched (vintage Schott/Jena BaK4-class barium crown, patent nd=1.5647, νd=55.8)
L6	Biconvex Positive	Unmatched (vintage Schott/Jena barium light flint, patent nd=1.6711, νd=47.3)