LEICA ELMARIT-R 28mm f/2.8 — Optical Cross-Section & Ray Tracing

Home / Lenses / Leica / LEICA ELMARIT-R 28mm f/2.8LEICA ELMARIT-R 28mm f/2.8US 3,591,257↗ — Walter Mandler, Garry Edwards, Erich Wagner
8 ELEMENTS / 6 GROUPS
f = 28 mm (e-line trace ≈ 29.2 mm)
F/2.8
2ω ≈ 74°
ALL SPHERICAL
Focus MechanismUnit focusing — entire optical assembly translates along the optical axis.
Optical Elements (8 physical)ElementTypeGlass
L1Negative MeniscusSK16 (SCHOTT)
L2Negative MeniscusSK16 (SCHOTT)
L3Biconvex PositiveUnmatched (LaF21-class patent e-line value; no verified d-line catalog identity)
L4Negative Meniscus813252 - high-index flint (patent nd=1.81265, vd=25.24; no exact public catalog match)
L5Negative MeniscusSK16 (SCHOTT)
L6Plano-Convex PositiveLaF10 class; S-BAH28 catalog e-line spectral proxy (production supplier unspecified)
L7Negative Meniscus813252 - high-index flint (patent nd=1.81265, vd=25.24; no exact public catalog match)
L8Negative MeniscusF2 (Schott; patent ne=1.62408, ve=36.11 stored as nd/vd)

Element	Type	Glass
L1	Negative Meniscus	SK16 (SCHOTT)
L2	Negative Meniscus	SK16 (SCHOTT)
L3	Biconvex Positive	Unmatched (LaF21-class patent e-line value; no verified d-line catalog identity)
L4	Negative Meniscus	813252 - high-index flint (patent nd=1.81265, vd=25.24; no exact public catalog match)
L5	Negative Meniscus	SK16 (SCHOTT)
L6	Plano-Convex Positive	LaF10 class; S-BAH28 catalog e-line spectral proxy (production supplier unspecified)
L7	Negative Meniscus	813252 - high-index flint (patent nd=1.81265, vd=25.24; no exact public catalog match)
L8	Negative Meniscus	F2 (Schott; patent ne=1.62408, ve=36.11 stored as nd/vd)