MAMIYA-SEKOR C 55mm f/2.8 N — Optical Cross-Section & Ray Tracing

Home / Lenses / Mamiya / MAMIYA-SEKOR C 55mm f/2.8 NMAMIYA-SEKOR C 55mm f/2.8 NJP S55-45883 B2↗ — Yusuke Arisaka
8 ELEMENTS / 6 GROUPS
f = 54.9999 mm
F/2.8
65°
ALL-SPHERICAL
Focus MechanismCONSTRAINED_RECONSTRUCTION: rigid unit focus solved at the manufacturer's 0.45 m film-plane MFD; all internal gaps remain fixed and only the rear air distance increases by 9.830450 mm, giving 0.178736× magnification.
Optical Elements (8 physical)ElementTypeGlass
L1Negative Meniscus516641 — catalog-equivalent class (vendor unresolved)
L2Positive Meniscus581407 — catalog-equivalent class (vendor unresolved)
L3Biconvex Positive773496 — catalog-equivalent class (vendor unresolved)
L4Biconcave Negative567428 — catalog-equivalent class (vendor unresolved)
L5Positive Meniscus694532 — catalog-equivalent class (vendor unresolved)
L6Biconcave Negative723380 — catalog-equivalent class (vendor unresolved)
L7Biconvex Positive516641 — catalog-equivalent class (vendor unresolved)
L8Positive Meniscus694532 — catalog-equivalent class (vendor unresolved)

Element	Type	Glass
L1	Negative Meniscus	516641 — catalog-equivalent class (vendor unresolved)
L2	Positive Meniscus	581407 — catalog-equivalent class (vendor unresolved)
L3	Biconvex Positive	773496 — catalog-equivalent class (vendor unresolved)
L4	Biconcave Negative	567428 — catalog-equivalent class (vendor unresolved)
L5	Positive Meniscus	694532 — catalog-equivalent class (vendor unresolved)
L6	Biconcave Negative	723380 — catalog-equivalent class (vendor unresolved)
L7	Biconvex Positive	516641 — catalog-equivalent class (vendor unresolved)
L8	Positive Meniscus	694532 — catalog-equivalent class (vendor unresolved)