If a higher ratio is desired (for example 5:1), adjust the fill light until f/5.6 is read on the flash meter.
The main light is now putting four times as much light on the subject as is the fill light.
Any ratio may be obtained using this method. After establishing the ratio, meter both lights striking the
subject to obtain the exposure.
Using Flash Outdoors.
Sometimes it is desirable to use flash outdoors in order to fill in shadows. For example, the overall
lighting conditions may be sunny and positioning the subject so that their face is lighted may cause them
to squint. Moving them so that they do not face the sun may help to solve this problem but may create
another dilemma; there is now enough general illumination for the scene but the face might now be in
shadow. In order to provide good, overall lighting, you should use flash. You must, however, account
for the ambient light that exists in the scene and set your flash accordingly. In other words, you must
a. Procedure for Correct Settings. The following procedure can be used to provide the correct
Set both camera and flash to manual operation.
Set your camera shutter speed to the correct speed to synchronize with flash.
Focus on your subject.
Meter the lighter part of the scene.
Set your lens to the f/stop that combines with your shutter synchronization speed to
produce correct exposure for available light.
b. Adjusting the Flash Light. For natural-looking fill, you need to adjust the light from the flash
so that it is about one stop less than the scene overall.
This may be done in either of the following ways:
(1) If flash has adjustable power setting:
(a) Follow steps under paragraph a.
(b) Set film speed on flash calculator dial.