NIKON R-UW AF FISHEYE-NIKKOR 13mm f/2.8 — Optical Cross-Section & Ray Tracing

Home / Lenses / Nikon / NIKON R-UW AF FISHEYE-NIKKOR 13mm f/2.8NIKON R-UW AF FISHEYE-NIKKOR 13mm f/2.8US 5,579,169↗ — Motohisa Mouri
10 ELEMENTS / 7 GROUPS
f = 12.32 mm in water
F/2.87
2ω = 170.6°
ALL-SPHERICAL
Focus MechanismUS 5,579,169 permits either unit focus or G1/G7-fixed internal-unit focus by translating G2-G6 together; no close-focus spacing table is published.
Optical Elements (10 physical)ElementTypeGlass
L1Negative MeniscusN-BK7 (SCHOTT) / 517642 crown class
L2Negative MeniscusJ-LAK02 (HIKARI) / 670574 class, close
L3Negative MeniscusS-LAL14 (OHARA) / 697555 lanthanum crown class
L4Biconvex PositiveUnmatched dense flint (595355)
L5Negative MeniscusJ-LASF017 (Hikari catalog-equivalent to patent 797454; supplier not identified)
L6Negative MeniscusNBFD2 (HOYA catalog equivalent; production supplier unspecified; patent 796409)
L7Biconvex PositiveJ-PKH1 (HIKARI) / 519699 phosphate crown
L8Biconvex Positive517699 phosphate-crown class; J-PKH1 catalog spectral proxy (production supplier unspecified)
L9Negative MeniscusN-SF6HT (SCHOTT) / 805254 dense flint class
L10Plane Parallel PlateN-BK7 (SCHOTT) / 517642 crown class

Element	Type	Glass
L1	Negative Meniscus	N-BK7 (SCHOTT) / 517642 crown class
L2	Negative Meniscus	J-LAK02 (HIKARI) / 670574 class, close
L3	Negative Meniscus	S-LAL14 (OHARA) / 697555 lanthanum crown class
L4	Biconvex Positive	Unmatched dense flint (595355)
L5	Negative Meniscus	J-LASF017 (Hikari catalog-equivalent to patent 797454; supplier not identified)
L6	Negative Meniscus	NBFD2 (HOYA catalog equivalent; production supplier unspecified; patent 796409)
L7	Biconvex Positive	J-PKH1 (HIKARI) / 519699 phosphate crown
L8	Biconvex Positive	517699 phosphate-crown class; J-PKH1 catalog spectral proxy (production supplier unspecified)
L9	Negative Meniscus	N-SF6HT (SCHOTT) / 805254 dense flint class
L10	Plane Parallel Plate	N-BK7 (SCHOTT) / 517642 crown class