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

Home / Lenses / Leica / LEICA SUMMICRON-R 50mm f/2LEICA SUMMICRON-R 50mm f/2US 4,123,144↗ — Walter Mandler, Garry Edwards, Erich Wagner
6 elements / 4 groups
52.5 mm design focal length
f/2
45° patent full field
All-spherical Gauss objective
Focus MechanismUnit focus; the full optical cell translates as one rigid assembly. The close-focus BF value adds 7.0 mm, derived from Leica's 1:7.5 reproduction-ratio specification at 52.5 mm.
Optical Elements (6 physical)ElementTypeGlass
L1Positive MeniscusSF10 (Schott; patent ne=1.73430, ve=28.19 stored as nd/vd)
L2Plano-ConvexZBaF17/BaSF6 class; J-BASF6 catalog e-line spectral proxy (production supplier unspecified)
L3Plano-ConcaveSF11 (Schott; patent ne=1.79190, ve=25.55 stored as nd/vd)
L4Plano-ConcaveSF2 (Schott; patent ne=1.65222, ve=33.60 stored as nd/vd)
L5Plano-ConvexUnmatched (LaF21/N-LAF21-class lanthanum flint; patent ne=1.79227, νe=47.15)
L6Plano-ConvexUnmatched (LaF21/N-LAF21-class lanthanum flint; patent ne=1.79227, νe=47.15)

Element	Type	Glass
L1	Positive Meniscus	SF10 (Schott; patent ne=1.73430, ve=28.19 stored as nd/vd)
L2	Plano-Convex	ZBaF17/BaSF6 class; J-BASF6 catalog e-line spectral proxy (production supplier unspecified)
L3	Plano-Concave	SF11 (Schott; patent ne=1.79190, ve=25.55 stored as nd/vd)
L4	Plano-Concave	SF2 (Schott; patent ne=1.65222, ve=33.60 stored as nd/vd)
L5	Plano-Convex	Unmatched (LaF21/N-LAF21-class lanthanum flint; patent ne=1.79227, νe=47.15)
L6	Plano-Convex	Unmatched (LaF21/N-LAF21-class lanthanum flint; patent ne=1.79227, νe=47.15)