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aperture ring, again pushing down the EE Lock Pin.
EE Switch Pin
This pin comes out when the lens aperture ring is set
at the "A" mark. In this position, it transmits a signal
for AE photography.
Distance Scale
The distance scale indicates the distance between the
focused subject and the film plane. The scale is necessary
for checking the depth-of-field, for flash and for infrared
photography. The exact reading from the distance scale
is at the center of each number.
Infrared Mark "."
The infrared mark "." is used to make the necessary
adjustments to the camera for infrared photography.
The correction of the distance scale is required in
infrared photography because the focal point deviates
slightly from the one in ordinary photography. Focus
first in the ordinary manner, then adjust the distance
scale to the "." mark imprinted in red. For instance, if
the distance scale reads 10m after focusing, merely shift
the 10m mark to the "." mark. The position of the "."
mark on the F-1 is based on using film with a maximum
sensitivity of 800nm such as a Kodak IR 135 film and a
Wratten 87 filter.
Film Plane Indicator
The film plane indicator is used in the case when
focusing is done by actual measurement. Measure the
distance from the film plane indicator and set the
measured distance on the distance scale.
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Infrared Index
Index
Distance Scale
Film Plane Indicator