MAMIYA-SEKOR CS 35mm f/2.8 — Optical Cross-Section & Ray Tracing

Home / Lenses / Mamiya / MAMIYA-SEKOR CS 35mm f/2.8MAMIYA-SEKOR CS 35mm f/2.8JP1978-066222 — Katsunori Ebara
6 ELEMENTS / 6 GROUPS
f = 34.988 mm (MODELED)
F/2.8
2ω = 62° (PATENT)
ALL-SPHERICAL
Focus MechanismNO_INTERNAL_RECONSTRUCTION — static infinity prescription; the manufacturer's rounded 0.4 m MFD is catalog metadata only.
Optical Elements (6 physical)ElementTypeGlass
G1Negative Meniscus (convex to object)S-FSL5 catalog equivalent (production supplier not established; patent 487701)
G2Biconvex PositiveUnmatched (nd=1.69480, νd=55.5; nearest public 697555 lanthanum-crown family)
G3Negative Meniscus (convex to image)S-FSL5 catalog equivalent (production supplier not established; patent 487701)
G4Biconcave Negative755275 — dense flint class (catalog family unresolved)
G5Positive Meniscus (convex to image)744448 — lanthanum flint class (catalog family unresolved)
G6Biconvex Positive713539 — lanthanum crown class (catalog family unresolved)

Element	Type	Glass
G1	Negative Meniscus (convex to object)	S-FSL5 catalog equivalent (production supplier not established; patent 487701)
G2	Biconvex Positive	Unmatched (nd=1.69480, νd=55.5; nearest public 697555 lanthanum-crown family)
G3	Negative Meniscus (convex to image)	S-FSL5 catalog equivalent (production supplier not established; patent 487701)
G4	Biconcave Negative	755275 — dense flint class (catalog family unresolved)
G5	Positive Meniscus (convex to image)	744448 — lanthanum flint class (catalog family unresolved)
G6	Biconvex Positive	713539 — lanthanum crown class (catalog family unresolved)