Pentax P3 - Page 27

When setting shutter speed first
Set the shutter dial to the desired shutter speed. Rotate the aperture
ring until the shutter-speed display changes from a blinking speed to
a just glowing speed, namely, only one shutter speed is seen, so that
correct exposure can be obtained. If the display does not switch
from a blinking speed to a glowing speed even by turning the
aperture ring, reset the shutter speed by turning the shutter dial.
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