Cactus KF36 Instruction Manual - page 18

16

Fill-in Flash

To handle these needs, you can reduce the light output levels from full power 

to 1/2, 1/4 or 1/16 power using your flash’s variable power system with 

Vari-Power.

To operate the Vari-Power system:

As you turn the inner ring, Calculator Dial will automatically indicate the new 

f-stop above the flash-to-subject distance.

Your flash can be used outdoors in daytimes, either for better lighting on 

overcast days or to reduce shadows on bright days.

Set your camera to the correct shutter speed for synchronization with 

electronic flash. (Refer to your camera instructions for the correct speed)

Using your built-in or hand-held meter, determine the f-stop required for a 

daylight exposure at the flash sync speed.

Align Vari-Power Dial (19) to the camera-to-subject distance with the 

f-stop indicated by the meter.

1.

2.

3.

Example: Zoom / Bounce Head in NORM position, ISO 100 (DIN 21), 

synchronized at 1/60, meter reading f16, camera-to-subject distance 5 ft. You 

want strong fill-in flash. Rotate Vari-Power Dial (inner ring of Calculator Dial) 

until f16 aligns with 5 feet, and your resulting Vari-Power reading is 1/2 (see 

photo C). Recheck the film speed /ISO setting to make sure it hasn’t been 

inadvertently moved.) You then change your Mode Selector Dial to read 1/2. 

For normal rather than strong fill, change Vari-Power settings to 1/4.

Note: By zooming the Head from NORM to WIDE, you can change 

exposure by 1/2 f-stop.

1.

Set the black arrow of

Vari-Power Dial (inner ring of the 

Calculator Dial) to:

1/2

1/4

1/16

2.

Set Mode Selector Dial to:

1/2

1/4

1/16

3.

Increase (open) camera aperture by:

1 f-stop

2 f-stop

4 f-stop