LEICA SUMMICRON-M 50mm f/2 — Optical Cross-Section & Ray Tracing

Home / Lenses / Leica / LEICA SUMMICRON-M 50mm f/2LEICA SUMMICRON-M 50mm f/2US 4,123,144↗, Example 9 — Walter Mandler, Garry Edwards, Erich Wagner
6 ELEMENTS / 4 GROUPS
f = 50.0 mm
F/2.0
2ω = 45°
ALL SPHERICAL
Focus MechanismUnit focusing — entire optical cell translates forward. Patent publishes infinity only; the 0.7 m state is a paraxial thick-lens extension (calculated).
Optical Elements (6 physical)ElementTypeGlass
L1Positive MeniscusN-LAF21 (Schott; LaFN21-class lanthanum flint, e-line coordinate proxy ne 1.79195 / νe 47.25; supplier unconfirmed)
L2Plano-Convex PositiveJ-BASF6 (Hikari; BaSF6-class barium flint, exact e-line coordinates ne 1.67133 / νe 41.60; supplier unconfirmed)
L3Plano-Concave NegativeSF10 (Schott; exact e-line coordinates ne 1.73430 / νe 28.19; supplier unconfirmed)
L4Plano-Concave NegativeE-F1 (Hoya; F1-class flint, exact e-line coordinates ne 1.63003 / νe 35.48; supplier unconfirmed)
L5Plano-Convex PositiveLAF3 (Hoya; LaF3-class lanthanum flint, exact e-line coordinates ne 1.72056 / νe 47.73; supplier unconfirmed). Same glass as L6.
L6Plano-Convex PositiveLAF3 (Hoya; LaF3-class lanthanum flint, exact e-line coordinates ne 1.72056 / νe 47.73; supplier unconfirmed). Same glass as L5.

Element	Type	Glass
L1	Positive Meniscus	N-LAF21 (Schott; LaFN21-class lanthanum flint, e-line coordinate proxy ne 1.79195 / νe 47.25; supplier unconfirmed)
L2	Plano-Convex Positive	J-BASF6 (Hikari; BaSF6-class barium flint, exact e-line coordinates ne 1.67133 / νe 41.60; supplier unconfirmed)
L3	Plano-Concave Negative	SF10 (Schott; exact e-line coordinates ne 1.73430 / νe 28.19; supplier unconfirmed)
L4	Plano-Concave Negative	E-F1 (Hoya; F1-class flint, exact e-line coordinates ne 1.63003 / νe 35.48; supplier unconfirmed)
L5	Plano-Convex Positive	LAF3 (Hoya; LaF3-class lanthanum flint, exact e-line coordinates ne 1.72056 / νe 47.73; supplier unconfirmed). Same glass as L6.
L6	Plano-Convex Positive	LAF3 (Hoya; LaF3-class lanthanum flint, exact e-line coordinates ne 1.72056 / νe 47.73; supplier unconfirmed). Same glass as L5.