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In 1977, Nikon introduced Al-Nikkor lenses which feature full
aperture metering via Nikon's "Automatic Maximum Aperture
Indexing" or "Al" system. Just by mounting an Al lens on the
camera, the maximum aperture is automatically indexed into the
camera's metering system. All Al-type lenses feature a meter
coupling ridge and a meter coupling shoe having two holes
(Illust. 1).
Then in 1981, Nikon modified their entire line of Al-Nikkor lenses,
so that they would be fully compatible with the upcoming
Nikon FA. These new lenses, called Al-S Nikkor, are easily
distinguishable by (a) an orange minimum aperture on both
regular aperture and aperture-direct-readout (ADR) scales
(Illust. 2), and (b) a special notch on the bayonet mount
(Illust. 3). In addition, the Al-S symbol appears on the front cover
on the instruction manual for each lens.
When used with the Nikon FA in the programmed mode, Al-S
lenses provide either a normal or high-speed program depending
on the focal length in use; in the shutter-priority mode, they give
you uniform exposure control in any lighting situation.
Nikon Series E lenses also have the same features as Al-S
Nikkors, but do not have a meter coupling shoe. Of course, older
Al-Nikkor and Al modified Nikkor lenses can be used with all
current and older Nikon cameras, including the FA Nikon's new
series of teleconverters–the TC-201, TC-301, TC-14A and
TC-14B–have been specially designed for Al-S Nikkor lenses, but
can be used with older Al-type lenses, too As soon as they are
attached, they automatically switch the FA to the high-speed
program in the programmed mode.
Al-S Nikkor: An Updated Version of Al-Nikkor Lenses
Illust.1
Illust.2
Illust.3
Al-Type Lens
Al-S Nikkor Lens
Lens type signal notch
48
64
66
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