NIKON AI-S NIKKOR 50mm f/1.2 — Optical Cross-Section & Ray Tracing

Home / Lenses / Nikon / NIKON AI-S NIKKOR 50mm f/1.2NIKON AI-S NIKKOR 50mm f/1.2US 4,621,909 Example 3 — Hamanishi / Nippon Kogaku
7 elements / 6 groups
f = 51.6 mm design / 50 mm nominal
F1.2
2ω = 46.4° patent / 46° Nikon spec
All-spherical modified Gauss
Focus MechanismPatent three-unit floating short-distance correction; variable-gap endpoint is d0 = 514.966 mm from the first surface and m ≈ -0.10. Production AI-S specification is 0.5 m and 1:7.9.
Optical Elements (7)ElementTypeGlass
L1Positive MeniscusUnmatched Nikon/Hikari lanthanum glass (797/455; J-LASF017 / TAF2 class)
L2Positive MeniscusUnmatched lanthanum dense flint (796/410; closest J-LASF02 / S-LAH52 class)
L3Negative MeniscusJ-SF1 / E-FD1L class (717/295)
L4Negative LensJ-SF4 / N-SF4 class (755/276)
L5Positive LensJ-LASF016 / TAF1 class (773/494 patent; catalog class 773/496)
L6Positive MeniscusJ-LASF016 / TAF1 class (773/494 patent; catalog class 773/496)
L7Biconvex PositiveS-LAM60 / J-LAF010 / NBF1 class (744/495 patent; catalog class 743/493)
AnalysisDetailed analysis available in the interactive viewer above.

Element	Type	Glass
L1	Positive Meniscus	Unmatched Nikon/Hikari lanthanum glass (797/455; J-LASF017 / TAF2 class)
L2	Positive Meniscus	Unmatched lanthanum dense flint (796/410; closest J-LASF02 / S-LAH52 class)
L3	Negative Meniscus	J-SF1 / E-FD1L class (717/295)
L4	Negative Lens	J-SF4 / N-SF4 class (755/276)
L5	Positive Lens	J-LASF016 / TAF1 class (773/494 patent; catalog class 773/496)
L6	Positive Meniscus	J-LASF016 / TAF1 class (773/494 patent; catalog class 773/496)
L7	Biconvex Positive	S-LAM60 / J-LAF010 / NBF1 class (744/495 patent; catalog class 743/493)