KODAK EKTAR 50mm f/3.5 — Optical Cross-Section & Ray Tracing

Home / Lenses / Kodak / KODAK EKTAR 50mm f/3.5KODAK EKTAR 50mm f/3.5US 2,165,328↗ — George H. Aklin, Fred E. Altman
4 ELEMENTS / 3 GROUPS
51.60 mm DESIGN / 50 mm MARKETED
f/3.5 (MODELED STOP CALIBRATED)
ALL-SPHERICAL
Focus MechanismNO_INTERNAL_RECONSTRUCTION — static infinity prescription only; 1.0668 m is the common documented 3.5 ft normal-focus near limit, not a modeled focus state.
Optical Elements (4 physical)ElementTypeGlass
L1Positive MeniscusN-SK16 (SCHOTT catalog equivalent; patent 620/604; production supplier unspecified)
L2Biconcave NegativeF15 (HOYA catalog proxy; patent 605/382; production supplier unspecified)
L3Biconvex PositiveK-SK18 (SUMITA catalog equivalent; patent 639/555; production supplier unspecified)
L4Negative MeniscusC12 (HOYA catalog proxy; patent 523/584; production supplier unspecified)

Element	Type	Glass
L1	Positive Meniscus	N-SK16 (SCHOTT catalog equivalent; patent 620/604; production supplier unspecified)
L2	Biconcave Negative	F15 (HOYA catalog proxy; patent 605/382; production supplier unspecified)
L3	Biconvex Positive	K-SK18 (SUMITA catalog equivalent; patent 639/555; production supplier unspecified)
L4	Negative Meniscus	C12 (HOYA catalog proxy; patent 523/584; production supplier unspecified)