NIKON NIKKOR 28mm f/2.8 (Nikon 28Ti) — Optical Cross-Section & Ray Tracing

Home / Lenses / Nikon / NIKON NIKKOR 28mm f/2.8 (Nikon 28Ti)NIKON NIKKOR 28mm f/2.8 (Nikon 28Ti)US 5,528,428 Ex. 3 — Ohtake & Mori / Nikon
7 ELEMENTS / 5 GROUPS
f ≈ 28.9 mm
F/2.87
2ω ≈ 74.0°
ALL SPHERICAL
Focus MechanismUnit focus — entire lens assembly moves axially.
Optical Elements (7)ElementTypeGlass
L1Negative MeniscusS-TIL6 (OHARA)
L2aBiconvex Positive840433 - lanthanum flint (patent nd=1.84042, vd=43.30; no exact public catalog match)
L2bBiconcave NegativeE-FD2 (HOYA)
L3aBiconvex PositiveS-LAH59 (OHARA)
L3bBiconcave NegativeEF3 (HOYA)
L4Positive Meniscus797454 — discontinued lanthanum glass (no exact public catalog match)
L5Negative Meniscus595/355 (close to S-FTM16, OHARA)
AnalysisDetailed analysis available in the interactive viewer above.

Element	Type	Glass
L1	Negative Meniscus	S-TIL6 (OHARA)
L2a	Biconvex Positive	840433 - lanthanum flint (patent nd=1.84042, vd=43.30; no exact public catalog match)
L2b	Biconcave Negative	E-FD2 (HOYA)
L3a	Biconvex Positive	S-LAH59 (OHARA)
L3b	Biconcave Negative	EF3 (HOYA)
L4	Positive Meniscus	797454 — discontinued lanthanum glass (no exact public catalog match)
L5	Negative Meniscus	595/355 (close to S-FTM16, OHARA)