NIKON NIKKOR-SW 90mm f/4.5 — Optical Cross-Section & Ray Tracing

Home / Lenses / Nikon / NIKON NIKKOR-SW 90mm f/4.5NIKON NIKKOR-SW 90mm f/4.5US 4,176,915↗ — Ikuo Mori
7 ELEMENTS / 4 GROUPS
f ≈ 90.4 mm
F/4.5
2ω ≈ 105° (f/16)
IMAGE CIRCLE 235 mm (f/16)
ALL SPHERICAL
Focus MechanismUnit focus by view-camera bellows: the whole lens translates and only the rear-vertex-to-image distance changes. The 1.0 m close-focus state is a modeling choice, solved from the exact paraxial conjugate; Nikon publishes no minimum focus for this lens.
Optical Elements (7 physical)ElementTypeGlass
L1Negative Meniscus573575 — barium crown, BaK1 class (N-BAK1 / H-BaK8 coordinate-exact)
L2ABiconvex Positive802444 — lanthanum dense flint, LaSF11 class (nearest NBFD14 HOYA, Δnd −0.0005; supplier unconfirmed)
L2BBiconcave Negative672388 — barium dense flint class (nearest S-NBH52V OHARA, Δnd +0.0014, Δνd −0.5; supplier unconfirmed)
L2CPositive Meniscus520701 — phosphate crown class (nearest J-PKH1 HIKARI, Δnd −0.0014; supplier unconfirmed)
L3APositive Meniscus607402 — barium dense flint, BaSF/BaFD3 class (BAFD3 HOYA coordinate-compatible, Δνd +0.16; supplier unconfirmed)
L3BNegative MeniscusSF1 class (717295; Hoya E-FD1 / Ohara S-TIH1 / Schott SF1 coordinate-exact)
L4Negative Meniscus734510 — lanthanum crown, LaKN12 class (LAKN12 SUMITA coordinate-compatible, Δνd +0.2; TAC4 HOYA alternate; supplier unconfirmed)

Element	Type	Glass
L1	Negative Meniscus	573575 — barium crown, BaK1 class (N-BAK1 / H-BaK8 coordinate-exact)
L2A	Biconvex Positive	802444 — lanthanum dense flint, LaSF11 class (nearest NBFD14 HOYA, Δnd −0.0005; supplier unconfirmed)
L2B	Biconcave Negative	672388 — barium dense flint class (nearest S-NBH52V OHARA, Δnd +0.0014, Δνd −0.5; supplier unconfirmed)
L2C	Positive Meniscus	520701 — phosphate crown class (nearest J-PKH1 HIKARI, Δnd −0.0014; supplier unconfirmed)
L3A	Positive Meniscus	607402 — barium dense flint, BaSF/BaFD3 class (BAFD3 HOYA coordinate-compatible, Δνd +0.16; supplier unconfirmed)
L3B	Negative Meniscus	SF1 class (717295; Hoya E-FD1 / Ohara S-TIH1 / Schott SF1 coordinate-exact)
L4	Negative Meniscus	734510 — lanthanum crown, LaKN12 class (LAKN12 SUMITA coordinate-compatible, Δνd +0.2; TAC4 HOYA alternate; supplier unconfirmed)