MAMIYA N 210mm f/8 L — Optical Cross-Section & Ray Tracing

Home / Lenses / Mamiya / MAMIYA N 210mm f/8 LMAMIYA N 210mm f/8 LJP 2000-028919 A↗ — Hideyuki Suga
7 ELEMENTS / 5 GROUPS
f = 209.958 mm (SCALED DESIGN)
F/8.15 MODELED / f/8 MARKETED
2ω = 24.38°
ALL-SPHERICAL TELEPHOTO
Focus MechanismNO_INTERNAL_RECONSTRUCTION: the patent publishes only the infinity prescription and no moving spacings. The marketed 7 m minimum focus distance is retained as metadata, not as an invented optical state.
Optical Elements (7 physical)ElementTypeGlass
L1Positive Meniscus, convex to object487702/704 fluor-crown class (catalog equivalent not unique)
L2Biconvex Positive497816 low-dispersion fluorophosphate-crown class
L3Biconcave Negative757478 lanthanum-flint class
L4Positive Meniscus, concave to object699301 dense-flint class
L5Biconcave Negative603606/607 dense-crown class
L6Biconvex Positive773496 lanthanum-flint class
L7Negative Meniscus, concave to object762265/266 dense-flint class

Element	Type	Glass
L1	Positive Meniscus, convex to object	487702/704 fluor-crown class (catalog equivalent not unique)
L2	Biconvex Positive	497816 low-dispersion fluorophosphate-crown class
L3	Biconcave Negative	757478 lanthanum-flint class
L4	Positive Meniscus, concave to object	699301 dense-flint class
L5	Biconcave Negative	603606/607 dense-crown class
L6	Biconvex Positive	773496 lanthanum-flint class
L7	Negative Meniscus, concave to object	762265/266 dense-flint class