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

Home / Lenses / Leica / LEICA ELCAN 50mm f/2LEICA ELCAN 50mm f/2US 3,649,104↗, Example 3 — Garry Edwards, Walter Mandler, Erich Wagner
4 ELEMENTS / 4 GROUPS
f ≈ 50.0 mm
F/2.0
2ω = 45°
ALL SPHERICAL
Focus MechanismUnit focusing — entire optical assembly translates as a rigid unit.
Optical Elements (4 physical)ElementTypeGlass
L1Positive MeniscusN-LAK9 (Schott; legacy LaK9 — e-line match ne = 1.69401, νe = 54.48)
L2Positive MeniscusN-BAF10 (Schott; legacy BaF10 — e-line match ne = 1.67341, νe = 46.83)
L3Negative MeniscusE-FD13 (Hoya; SF13-class dense flint — e-line proxy ne = 1.74707, νe = 27.54; supplier unconfirmed)
L4Biconvex PositiveLAFN7 (Schott — e-line match ne = 1.75458, νe = 34.72)

Element	Type	Glass
L1	Positive Meniscus	N-LAK9 (Schott; legacy LaK9 — e-line match ne = 1.69401, νe = 54.48)
L2	Positive Meniscus	N-BAF10 (Schott; legacy BaF10 — e-line match ne = 1.67341, νe = 46.83)
L3	Negative Meniscus	E-FD13 (Hoya; SF13-class dense flint — e-line proxy ne = 1.74707, νe = 27.54; supplier unconfirmed)
L4	Biconvex Positive	LAFN7 (Schott — e-line match ne = 1.75458, νe = 34.72)