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 3,740,120 A↗, Table III — Rudolf Rühl
8 ELEMENTS / 8 GROUPS
DESIGN f = 28.00 mm
DESIGN F/2.8
ALL SPHERICAL
UNIT FOCUS
Focus MechanismUnit focusing — the whole optical assembly moves forward; the 0.30 m extension (3.59 mm) is calculated, not printed.
Optical Elements (8 physical)ElementTypeGlass
L1Negative MeniscusN-FK5 (Schott catalog equivalent of FK5; patent ne 1.48914 / νe 70.22; production supplier unspecified)
L2Biconvex PositiveJ-BASF6 (HIKARI catalog equivalent of BaSF6, catalog νe 41.60; patent ne 1.67133 / νe 41.64; production supplier unspecified)
L3Negative MeniscusN-FK5 (Schott catalog equivalent of FK5; patent ne 1.48914 / νe 70.22; production supplier unspecified)
L4Positive MeniscusN-BAF10 (Schott catalog equivalent of BaF10; patent ne 1.67341 / νe 46.82; production supplier unspecified)
L5Biconvex PositiveN-LAK9 (Schott catalog equivalent of LaK9; patent ne 1.69401 / νe 54.48; production supplier unspecified)
L6Biconcave NegativeSF56A (Schott catalog equivalent of SF56; patent ne 1.7918 / νe 25.87; production supplier unspecified)
L7Positive MeniscusN-LAK9 (Schott catalog equivalent of LaK9; patent ne 1.69401 / νe 54.48; production supplier unspecified)
L8Biconvex PositiveN-LAK9 (Schott catalog equivalent of LaK9; patent ne 1.69401 / νe 54.48; production supplier unspecified)

Element	Type	Glass
L1	Negative Meniscus	N-FK5 (Schott catalog equivalent of FK5; patent ne 1.48914 / νe 70.22; production supplier unspecified)
L2	Biconvex Positive	J-BASF6 (HIKARI catalog equivalent of BaSF6, catalog νe 41.60; patent ne 1.67133 / νe 41.64; production supplier unspecified)
L3	Negative Meniscus	N-FK5 (Schott catalog equivalent of FK5; patent ne 1.48914 / νe 70.22; production supplier unspecified)
L4	Positive Meniscus	N-BAF10 (Schott catalog equivalent of BaF10; patent ne 1.67341 / νe 46.82; production supplier unspecified)
L5	Biconvex Positive	N-LAK9 (Schott catalog equivalent of LaK9; patent ne 1.69401 / νe 54.48; production supplier unspecified)
L6	Biconcave Negative	SF56A (Schott catalog equivalent of SF56; patent ne 1.7918 / νe 25.87; production supplier unspecified)
L7	Positive Meniscus	N-LAK9 (Schott catalog equivalent of LaK9; patent ne 1.69401 / νe 54.48; production supplier unspecified)
L8	Biconvex Positive	N-LAK9 (Schott catalog equivalent of LaK9; patent ne 1.69401 / νe 54.48; production supplier unspecified)