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 Example 8 — Mandler / Edwards / 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)ElementTypeGlass
L1Positive MeniscusUnmatched (Schott SF10 e-line constants; patent ne=1.73430, ve=28.19 stored as nd/vd)
L2Plano-ConvexZBaF17 / BaSF6-class (CDGM/Schott equivalent; patent ne/νe values stored as nd/vd)
L3Plano-ConcaveUnmatched (Schott SF11 e-line constants; patent ne=1.79190, ve=25.55 stored as nd/vd)
L4Plano-ConcaveUnmatched (Schott SF2 e-line constants; 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)
AnalysisDetailed analysis available in the interactive viewer above.

Element	Type	Glass
L1	Positive Meniscus	Unmatched (Schott SF10 e-line constants; patent ne=1.73430, ve=28.19 stored as nd/vd)
L2	Plano-Convex	ZBaF17 / BaSF6-class (CDGM/Schott equivalent; patent ne/νe values stored as nd/vd)
L3	Plano-Concave	Unmatched (Schott SF11 e-line constants; patent ne=1.79190, ve=25.55 stored as nd/vd)
L4	Plano-Concave	Unmatched (Schott SF2 e-line constants; 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)