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OPERATION OF CAMERA CONTROLS
Setting the Film Speed
As film response sensitivity during exposure to light
(called "film speed") varies with film type, adjustment
of the camera's metering circuit is essential to ensure
uniform exposures under all operational conditions.
Thus,
a film-speed dial (ASA graduations) is provided
for this purpose, with a safety lock mechanism built-in
to prevent accidental shifting of
the
dial during shooting.
To set the film speed, depress the film-speed dial lock
and,
while holding the lock depressed, turn the ASA
film-speed dial until the red index mark is aligned with
the ASA value for the film in use. After setting the
dial,
release the lock and test the dial to ensure that it is set
firmly at the desired ASA value. The meter is sensitive
across the full range of from ASA 12 to ASA 3200.
The film-speed dial has two graduations between each
pair of numbers for intermediate settings such as 64,
80,
125, etc. The figure below indicates the values for
all intermediate settings.
12