Aperture, Continued
Aperture
There may be times when you do not have access to light meters or the light
settings without
light meters
meter in your camera is not working. You can improve your chances of
taking usable exposures if you follow the f/16 rule. The f/16 rule is based on
the correct exposure for an average front-lighted subject under bright, sunny
conditions.
To use the f/l6 rule:
Step
Action
1
Set the aperture of the camera to f/16.
2
Set the shutter speed on the camera to most closely approximate the
rated ISO of the film. For example, if the film is rated at ISO 125,
set the shutter speed at l/125 of a second.
The f/16 rule is a way to calculate alternate f/stops should environmental
conditions deteriorate. The following table lists different aperture settings
for daylight conditions.
Condition
f/stop
Bright sun, light sand, or snow
f/22
Bright sun
f/16
Cloudy but bright
f/11
Cloudy
f/8
Overcast or open shade
f/5.6
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