NIKON AI NIKKOR 28mm f/2.8S — Optical Cross-Section & Ray Tracing

Home / Lenses / Nikon / NIKON AI NIKKOR 28mm f/2.8SNIKON AI NIKKOR 28mm f/2.8SUS 5,917,663↗ — Kenzaburo Suzuki
8 elements / 8 groups
f = 28.610 mm
FNO = 2.89
2omega = 74.1 deg
all-spherical
Focus MechanismProduction CRC changes the L4-L5 interval while the whole lens extends; patent Example 2 lists only infinity spacing, so close focus is approximated by BFD extension to the published 1:3.9 reproduction ratio.
Optical Elements (8 physical)ElementTypeGlass
L1Positive MeniscusN-BAF10 (SCHOTT; J-BAF10 class)
L2Negative MeniscusN-BK7 (SCHOTT; J-BK7A class)
L3Negative MeniscusN-BK7 (SCHOTT; J-BK7A class)
L4Plano-ConvexJ-BASF6 (HIKARI)
L5Plano-ConvexS-BSM16 (OHARA; J-SK16 class)
L6Biconcave NegativeSF4 (SCHOTT; J-SF4 class)
L7Positive MeniscusJ-LAK02 (HIKARI catalog equivalent; patent coordinate)
L8Biconvex PositiveJ-LAK02 (HIKARI catalog equivalent; patent coordinate)

Element	Type	Glass
L1	Positive Meniscus	N-BAF10 (SCHOTT; J-BAF10 class)
L2	Negative Meniscus	N-BK7 (SCHOTT; J-BK7A class)
L3	Negative Meniscus	N-BK7 (SCHOTT; J-BK7A class)
L4	Plano-Convex	J-BASF6 (HIKARI)
L5	Plano-Convex	S-BSM16 (OHARA; J-SK16 class)
L6	Biconcave Negative	SF4 (SCHOTT; J-SF4 class)
L7	Positive Meniscus	J-LAK02 (HIKARI catalog equivalent; patent coordinate)
L8	Biconvex Positive	J-LAK02 (HIKARI catalog equivalent; patent coordinate)