NIKON R-UW AF MICRO-NIKKOR 50mm f/2.8 — Optical Cross-Section & Ray Tracing

Home / Lenses / Nikon / NIKON R-UW AF MICRO-NIKKOR 50mm f/2.8NIKON R-UW AF MICRO-NIKKOR 50mm f/2.8US 5,257,137↗ — Fumio Suzuki, Yoshinari Hamanishi
10 elements / 9 groups
f = 51.6 mm in water
f/2.8
35° underwater field
1:1 macro
all-spherical
Focus MechanismInner focus: G2 + G3 translate toward the object; D2 decreases while D15 increases.
Optical Elements (10 physical)ElementTypeGlass
PLParallel Flat PlateN-BK7 (Schott) / J-BK7A class
L2FNegative MeniscusJ-LASFH2 (Hikari; patent nd=1.76684, vd=46.8)
L2R1Positive MeniscusN-SF6 / S-TIH6 / J-SF6 dense flint class (805254)
L2R2Biconvex PositiveJ-LASF017 (Hikari, 795453) close class; patent nd higher by about 0.0017
L2R3Biconcave NegativeSF1 / S-TIH1 / J-SF1 dense flint class (717295)
L31Biconcave NegativeJ-SFH2 (Hikari; patent coordinate 861230)
L32Biconvex PositiveJ-LASF017 (Hikari, 795453) close class; patent nd higher by about 0.0017
L33Positive MeniscusNBFD2 (HOYA catalog equivalent; production supplier unspecified; patent 796409)
L41Biconvex PositiveBAFD3 (HOYA catalog equivalent; production supplier unspecified; patent 607403)
L42Biconcave NegativeJ-LASF017 (Hikari, 795453) close class; patent nd higher by about 0.0017

Element	Type	Glass
PL	Parallel Flat Plate	N-BK7 (Schott) / J-BK7A class
L2F	Negative Meniscus	J-LASFH2 (Hikari; patent nd=1.76684, vd=46.8)
L2R1	Positive Meniscus	N-SF6 / S-TIH6 / J-SF6 dense flint class (805254)
L2R2	Biconvex Positive	J-LASF017 (Hikari, 795453) close class; patent nd higher by about 0.0017
L2R3	Biconcave Negative	SF1 / S-TIH1 / J-SF1 dense flint class (717295)
L31	Biconcave Negative	J-SFH2 (Hikari; patent coordinate 861230)
L32	Biconvex Positive	J-LASF017 (Hikari, 795453) close class; patent nd higher by about 0.0017
L33	Positive Meniscus	NBFD2 (HOYA catalog equivalent; production supplier unspecified; patent 796409)
L41	Biconvex Positive	BAFD3 (HOYA catalog equivalent; production supplier unspecified; patent 607403)
L42	Biconcave Negative	J-LASF017 (Hikari, 795453) close class; patent nd higher by about 0.0017