NIKON AI AF ZOOM-NIKKOR 24-120mm f/3.5-5.6 D IF — Optical Cross-Section & Ray Tracing

Home / Lenses / Nikon / NIKON AI AF ZOOM-NIKKOR 24-120mm f/3.5-5.6 D IFNIKON AI AF ZOOM-NIKKOR 24-120mm f/3.5-5.6 D IFUS 5,734,508 A↗ — Haruo Sato
15 ELEMENTS / 11 GROUPS
DESIGN f = 24.701-116.518 mm
F/3.60-5.90
2 ASPHERICAL ELEMENTS
G2 INTERNAL FOCUS
Focus MechanismCONSTRAINED_RECONSTRUCTION: patent-published infinity zoom states with a code-solved 0.5 m endpoint. Only G2 moves for focus; d16 + d26 is conserved while d31 and Bf remain fixed at each zoom position. The telephoto endpoint traces to approximately 0.21756x (about 1:4.60), rather than the rounded marketed 1:4.8.
Optical Elements (15 physical; 16 modeled media)ElementTypeGlass
L11Negative MeniscusJ-SFH2 (Hikari; patent code 861230)
L12Positive MeniscusLAC8 (coordinate equivalent; patent code 713539)
L13Positive Meniscus773495 — lanthanum crown / TAF class (vendor unresolved)
L21rHybrid Aspheric Resin LayerUnmatched (hybrid aspheric resin, nd=1.49521, vd=56.3)
L21gNegative MeniscusUnmatched (840434 high-index glass)
L22Biconcave NegativeUnmatched (840434 high-index glass)
L23Positive Meniscus689311 — high-dispersion flint class (vendor unresolved)
L24Biconvex Positive755276 — SF4 class (vendor unresolved)
L25Negative Meniscus773495 — lanthanum crown / TAF class (vendor unresolved)
L3F1Biconvex Positive517641 — BK7 class (vendor unresolved)
L3F2Biconvex Positive517641 — BK7 class (vendor unresolved)
L3F3Biconcave NegativeNBFD2 (HOYA catalog equivalent; production supplier unspecified; patent 796409)
L3R1Biconvex PositiveJ-SSK5 (Hikari; patent code 658508)
L3R2Negative Meniscus (1x Asph)795454 — LaSF class (catalog-near; vendor unresolved)
L3R3Biconcave NegativeNBFD10 (HOYA catalog equivalent; production supplier unspecified; patent 834374)
L3R4Biconvex PositiveJ-K3 (Hikari; patent code 518589)

Element	Type	Glass
L11	Negative Meniscus	J-SFH2 (Hikari; patent code 861230)
L12	Positive Meniscus	LAC8 (coordinate equivalent; patent code 713539)
L13	Positive Meniscus	773495 — lanthanum crown / TAF class (vendor unresolved)
L21r	Hybrid Aspheric Resin Layer	Unmatched (hybrid aspheric resin, nd=1.49521, vd=56.3)
L21g	Negative Meniscus	Unmatched (840434 high-index glass)
L22	Biconcave Negative	Unmatched (840434 high-index glass)
L23	Positive Meniscus	689311 — high-dispersion flint class (vendor unresolved)
L24	Biconvex Positive	755276 — SF4 class (vendor unresolved)
L25	Negative Meniscus	773495 — lanthanum crown / TAF class (vendor unresolved)
L3F1	Biconvex Positive	517641 — BK7 class (vendor unresolved)
L3F2	Biconvex Positive	517641 — BK7 class (vendor unresolved)
L3F3	Biconcave Negative	NBFD2 (HOYA catalog equivalent; production supplier unspecified; patent 796409)
L3R1	Biconvex Positive	J-SSK5 (Hikari; patent code 658508)
L3R2	Negative Meniscus (1x Asph)	795454 — LaSF class (catalog-near; vendor unresolved)
L3R3	Biconcave Negative	NBFD10 (HOYA catalog equivalent; production supplier unspecified; patent 834374)
L3R4	Biconvex Positive	J-K3 (Hikari; patent code 518589)