NIKON NIKKOR-N AUTO 28mm f/2 — Interactive Lens Diagram

Home / Lenses / Nikon / NIKON NIKKOR-N AUTO 28mm f/2NIKON NIKKOR-N AUTO 28mm f/2US 3,736,049 EXAMPLE 1 — NIPPON KOGAKU / SHIMIZU
9 ELEMENTS / 8 GROUPS
f ≈ 27.8 mm (design)
F/2.0
2ω ≈ 74.5°
ALL SPHERICAL
Focus MechanismCRC (Close-Range Correction): d9 between converter and master groups varies with focus distance.
Optical Elements (9)ElementTypeGlass
L1Negative MeniscusSK16 (Schott)
L2Positive MeniscusLAF2 (Schott) / S-LAM2 (OHARA)
L3Negative MeniscusSK16 (Schott)
L4Biconvex PositiveLACL60 (HOYA) / equiv. LaK
L5Biconcave NegativeBK7 (Schott) / S-BSL7 (OHARA)
L6Biconvex PositiveBK7 (Schott) / S-BSL7 (OHARA)
L7Biconcave NegativeFDS9 (HOYA) / SF56A (Schott)
L8Positive MeniscusDiscontinued LaF/LaK type (1970s)
L9Biconvex PositiveLAK8 (Schott) / S-LAL8 (OHARA)
AnalysisDetailed analysis available in the interactive viewer above.

Element	Type	Glass
L1	Negative Meniscus	SK16 (Schott)
L2	Positive Meniscus	LAF2 (Schott) / S-LAM2 (OHARA)
L3	Negative Meniscus	SK16 (Schott)
L4	Biconvex Positive	LACL60 (HOYA) / equiv. LaK
L5	Biconcave Negative	BK7 (Schott) / S-BSL7 (OHARA)
L6	Biconvex Positive	BK7 (Schott) / S-BSL7 (OHARA)
L7	Biconcave Negative	FDS9 (HOYA) / SF56A (Schott)
L8	Positive Meniscus	Discontinued LaF/LaK type (1970s)
L9	Biconvex Positive	LAK8 (Schott) / S-LAL8 (OHARA)