NIKON NIKKOR Z 40mm f/2 — Optical Cross-Section & Ray Tracing

Home / Lenses / Nikon / NIKON NIKKOR Z 40mm f/2NIKON NIKKOR Z 40mm f/2JP 2021-189351 A↗, Example 4 — Keigo Koida
6 ELEMENTS / 4 GROUPS
f ≈ 41.2 mm
F/2.04
2ω ≈ 55.4°
2 ASPHERICAL SURFACES (HYBRID COMPOSITE)
Focus MechanismInner focus (IF): G2 (L21–L23) translates 1.21 mm toward the object to the patent's near state (1.28 m, calculated). G1, aperture stop, and G3 remain fixed.
Optical Elements (6 physical; 8 modeled media)ElementTypeGlass
L11Biconvex PositiveS-LAH55V (OHARA)
L12Biconcave NegativeJ-SF1 (HIKARI)
L21Biconcave NegativeSF4 (SCHOTT spectral proxy; 755276 class, production identity unspecified)
L22Biconvex PositiveJ-LASF015 (HIKARI)
L22rPos. Meniscus (1× Asph)Unmatched (patent resin layer; chemistry and supplier unspecified)
L23Positive MeniscusS-LAH55V (OHARA)
L31rNeg. Meniscus (1× Asph)Unmatched (patent resin layer; chemistry and supplier unspecified)
L31Biconcave NegativeE-CF6 (HOYA)

Element	Type	Glass
L11	Biconvex Positive	S-LAH55V (OHARA)
L12	Biconcave Negative	J-SF1 (HIKARI)
L21	Biconcave Negative	SF4 (SCHOTT spectral proxy; 755276 class, production identity unspecified)
L22	Biconvex Positive	J-LASF015 (HIKARI)
L22r	Pos. Meniscus (1× Asph)	Unmatched (patent resin layer; chemistry and supplier unspecified)
L23	Positive Meniscus	S-LAH55V (OHARA)
L31r	Neg. Meniscus (1× Asph)	Unmatched (patent resin layer; chemistry and supplier unspecified)
L31	Biconcave Negative	E-CF6 (HOYA)