NIKON AF-S NIKKOR 14-24mm f/2.8 G ED

US 7,359,125 B2, Example 1 — Yoko Kimura, Haruo Sato

14 ELEMENTS / 11 GROUPS (+ HYBRID RESIN LAYER)
f = 14.4–23.8 mm
F/2.88
2ω = 114.7°–83.8°
3 ASPHERICAL SURFACES · 2 ED ELEMENTS

Focus Mechanism

Internal focus via the patent's L1 (E7+E8 cemented doublet), which moves toward the image: 4.43 mm (wide) to 4.01 mm (18 mm and tele) from infinity to a 300 mm object-to-image distance.

Optical Elements (14 physical; 15 modeled media)

ElementTypeGlass
L1Negative MeniscusS-LAH65V (catalog-compatible spectral proxy; patent 1.804/46.58, catalog 1.803999/46.5834; production supplier unspecified)
L2Neg. Meniscus (1× Asph)S-LAL12 (catalog-compatible spectral proxy; patent 1.6779/55.34, catalog 1.6779/55.34; production supplier unspecified)
L3Negative MeniscusLAK011 (catalog-compatible spectral proxy; patent 1.741/52.67, catalog 1.741/52.672067; production supplier unspecified)
L4Pos. Meniscus (Asph resin layer)554381 — hybrid-asphere resin layer (inferred; patent nd=1.55389, νd=38.09; not catalog glass)
L5Biconcave NegativeJ-FKH1 (catalog-compatible spectral proxy; patent 1.49782/82.52, catalog 1.49782/82.57; production supplier unspecified)
L6Biconvex PositiveS-LAH63 (catalog-compatible spectral proxy; patent 1.8044/39.59, catalog 1.804398/39.5862; production supplier unspecified)
L7Negative MeniscusS-LAH55 (catalog-compatible spectral proxy; patent 1.83481/42.72, catalog 1.834807/42.7137; production supplier unspecified)
L8Positive MeniscusE-BAF8 (catalog-compatible spectral proxy; patent 1.62374/47.04, catalog 1.62374/47.044346; production supplier unspecified)
L9Positive MeniscusJ-BK7A (catalog-compatible spectral proxy; patent 1.5168/64.1, catalog 1.5168/64.14; production supplier unspecified)
L10Biconcave NegativeS-LAH55 (catalog-compatible spectral proxy; patent 1.83481/42.72, catalog 1.834807/42.7137; production supplier unspecified)
L11Biconvex PositiveS-BAL2 (catalog-compatible spectral proxy; patent 1.57099/50.8, catalog 1.570989/50.799858; production supplier unspecified)
L12Negative MeniscusUnmatched (lanthanum crown; patent nd=1.772789, νd=49.45; no catalog glass at this index)
L13Biconvex PositiveJ-FKH1 (catalog-compatible spectral proxy; patent 1.49782/82.52, catalog 1.49782/82.57; production supplier unspecified)
L14Negative MeniscusS-LAH53 (catalog-compatible spectral proxy; patent 1.8061/40.94, catalog 1.806098/40.926; production supplier unspecified)
L15Biconvex Positive (1× Asph)S-BAL35 (catalog-compatible spectral proxy; patent 1.58913/61.18, catalog 1.58913/61.135024; production supplier unspecified)