Flash Unit Controls and Indicators

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).

On-off switch (fig.

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.

2-5