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BASIC OPERATION continued
The black line represents the norma program for an Al-S or
Al-Nikkor 50mm f/1.4 lens with ASA/ISO 100 film,whereas the
green line represents the high-speed program for an Al-S Nikkor
135mm l/2 lens. For lenses with different maximum apertures
(e.g. an Al-S or Al-Nikkor 24mm f/2 8 which is indicated by a red
line or an Al-S Nikkor 200mm f/4 by a pink line), the graph is
read from that particular aperture until intersection with the
diagonal line and then downward along the same line. Solid
program lines represent automatic multi-pattern metering,
whereas solid and dotted lines centerweighted metering. In
extremely bright lighting situations such as snow scenes,
scenes at the beach etc exposure compensation of approx +2
EV is required with conventions centerweighted metering.
Taking this into consideration, automatic multi pattern
metering s pre programmed to automatically make exposure
compensation by reducing extreme brightness to EV 16-1/3.
Programmed Exposure Measurement Graph
In the programmed automatic exposure mode, the FA provides
the optimum combination of aperture and shutter speed to
match the film speed in use and the brightness of the scene.
These combinations were arrived at through intensive
research and then fed into the FA's microcomputer to provide a
predetermined exposure program. Thus, when actual exposure
measurement takes place at the time of shooting, the ideal
combination on is selected, resulting in perfect exposures for
every shot.
Moreover, the FA features two different exposure programs to
match the lens focal length (applies only to Al-S Nikkor and
Nikon Series E lenses) The normal program is for lenses less
than 135mm; the high-speed program is for 135mm and longer
(including zoom lenses whose longest focal length exceeds
135mm). To minimize camera shake with telephoto lenses, the
high speed program does not go below 1/125 sec until the lens
maximum aperture is reached: then slower speeds are
progressively chosen. With all other lenses, the normal program
is in operation The h gin-speed program is also automatically
chosen by the FA when a Nikon Teleconverter TC-201, TC-301,
TC-14A, or TC-14B is attached to Al S, Nikon Series E, and
Al-Nikkor (including AI-modified) lenses; with Nikon
Teleconverters TC-200, TC-300, or TC 14, the normal program
is in operation.
21


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