LEICA SUPER-ANGULON-R 21mm f/4 — Optical Cross-Section & Ray Tracing

Home / Lenses / Leica / LEICA SUPER-ANGULON-R 21mm f/4LEICA SUPER-ANGULON-R 21mm f/4US 3,512,874↗ — Walter Wöltche
10 ELEMENTS / 8 GROUPS
21mm (20.9993mm MODELED EFL)
f/4
90° PATENT FIELD / 92° MARKETED ANGLE
ALL-SPHERICAL
Focus MechanismNO_INTERNAL_RECONSTRUCTION — static patent prescription only; production MFD 0.2 m is metadata, not a reconstructed focus state.
Optical Elements (10 physical)ElementTypeGlass
L1Positive MeniscusPC3 (HOYA equivalent; PK3 class, supplier unproven)
L2Negative MeniscusN-SK16 class (supplier unproven)
L3Negative MeniscusK-LaK11 (SUMITA equivalent; LaK11 class, supplier unproven)
L4Plano-Concave NegativeN-SK16 class (supplier unproven)
L5Biconvex PositiveFTM8 (OHARA proxy; supplier unproven)
L6Biconvex PositiveH-BaF6 class (supplier unproven)
L7Positive MeniscusS-TIL6 class (supplier unproven)
L8Biconcave NegativeFD3 (HOYA equivalent; SF3 class, supplier unproven)
L9Positive MeniscusN-SK16 class (supplier unproven)
L10Plano-Convex PositiveN-SK5 (SCHOTT equivalent; supplier unproven)

Element	Type	Glass
L1	Positive Meniscus	PC3 (HOYA equivalent; PK3 class, supplier unproven)
L2	Negative Meniscus	N-SK16 class (supplier unproven)
L3	Negative Meniscus	K-LaK11 (SUMITA equivalent; LaK11 class, supplier unproven)
L4	Plano-Concave Negative	N-SK16 class (supplier unproven)
L5	Biconvex Positive	FTM8 (OHARA proxy; supplier unproven)
L6	Biconvex Positive	H-BaF6 class (supplier unproven)
L7	Positive Meniscus	S-TIL6 class (supplier unproven)
L8	Biconcave Negative	FD3 (HOYA equivalent; SF3 class, supplier unproven)
L9	Positive Meniscus	N-SK16 class (supplier unproven)
L10	Plano-Convex Positive	N-SK5 (SCHOTT equivalent; supplier unproven)