Red dot (fig. 2-3) . . . . Indicates starting position for in-
serting lenses in bayonet mount
on camera.
Reference mark for shutter speed
Shutter speed index
scale.
Shutter speed dial. . . . . Indicates length of time (in sec-
onds) shutter will remain open
during exposure; also indicates
when shutter is set up for bulb
(B) exposure function. The
numbers on the dial indicate the
fractional part of a second the
shutter will be open; 60 means
an exposure time of 1 / 6 0; 250
means an exposure time of 1/250
sec.
2-2. Flash Unit Controls
and Indicators
a. Flush Unit Controls. The following list itemizes the
flash unit controls used by the operator and described their
function.
Function
Control
Open flash button
Completes electrical circuit to dis-
charge capacitor through flash
tube.
Automatic f/stop selec- Sets the amount of light required
for the f/stop setting at either
close range (Red, 2-10 ft) or ex-
tended range (Blue, 2-21 ft).
Energizes the capacitor and builds
up the charge.
AC/charge receptacle
Provides an external power source
for the flash unit or for recharg-
ing the built-in nickel cadmium
batteries.