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Setting
the
Film
Speed
To
program the F3AF to give the correct exposure with a par-
ticular film, you must first set the camera to the correct film
speed. The film speed, represented by
an
ASAIISO number,
is
a
numerical rating of the film's sensitivity to a given amount of
light: the higher the number, the greater the sensitivity, and vice
versa. This number
is
printed
on
the film carton and the cartridge
itself.
To
handle all film types, the camera's ASAIISO dial @ has
settings from ASAIISO
12
to 6400.
Two
dots between each pair
of ASAIISO numbers stand for intermediate settings, such as
64,
80
, etc. The table above gives the speeds for all intermediate
settings.
Note: In certain situations, you can set the ASAIISO dial to a setting
which is different from the recommended film speed. For example, some
photographers rate their color slide film
at
a slightly higher
ASA
I
ISO
set·
ting to produce intentional underexposure for more color saturation. Or
when shooting in very low light, you can "
push"
high· speed black-and·
white film by doubling or quadrupling the ASAI
ISO
, then overdeveloping
it to compensate for the underexposure.
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