LEICA SUMMICRON-C 40mm f/2 — Optical Cross-Section & Ray Tracing

Home / Lenses / Leica / LEICA SUMMICRON-C 40mm f/2LEICA SUMMICRON-C 40mm f/2DE 2 222 892 A1↗, Example 3 — Georg Knetsch, Hermann Desch, Heinz Marquardt, Walter Watz
6 ELEMENTS / 4 GROUPS
f = 39.9987 mm (DESIGN)
f/2
2ω = 56.8°
ALL-SPHERICAL
Focus MechanismNot modeled — production helical focus reaches 0.8 m, but the patent supplies only the nominal prescription; no finite-focus internal spacing is modeled.
Optical Elements (6 physical)ElementTypeGlass
L1Positive MeniscusUnmatched (native e-line ne=1.81527, nu_e=45.06; supplier unresolved)
L2Positive MeniscusUnmatched (native e-line ne=1.81527, nu_e=45.06; supplier unresolved)
L3Negative MeniscusSF56A (coordinate-compatible spectral proxy; supplier unconfirmed)
L4Negative MeniscusS-TIM6 (coordinate-compatible spectral proxy; supplier unconfirmed)
L5Positive MeniscusUnmatched (native e-line ne=1.69232, nu_e=49.18; supplier unresolved)
L6Positive MeniscusN-LAK21 (coordinate-compatible spectral proxy; supplier unconfirmed)

Element	Type	Glass
L1	Positive Meniscus	Unmatched (native e-line ne=1.81527, nu_e=45.06; supplier unresolved)
L2	Positive Meniscus	Unmatched (native e-line ne=1.81527, nu_e=45.06; supplier unresolved)
L3	Negative Meniscus	SF56A (coordinate-compatible spectral proxy; supplier unconfirmed)
L4	Negative Meniscus	S-TIM6 (coordinate-compatible spectral proxy; supplier unconfirmed)
L5	Positive Meniscus	Unmatched (native e-line ne=1.69232, nu_e=49.18; supplier unresolved)
L6	Positive Meniscus	N-LAK21 (coordinate-compatible spectral proxy; supplier unconfirmed)