Controlling Exposure- Camera meters and subject brightness
Black, White and Gray are the building blocks of all photographs.
Our eyes and the camera
capture a scene by processing the light reflected from objects that pass
through a lens to the retina or film. Our eyes automatically compensate
for variations in lighting, the camera needs to be controlled. Some cameras
can work automatically, others need manual adjustment. We use a light
meter to determine the proper settings. The camera is designed to work
with "average" subjects and sometimes is fooled by subjects
that are predominately light or dark.
This is a simple five frame exercise that can help determine if your camera is working correctly and also demonstrates the way your meter reacts to non average subjects. You must complete this successfully- if it doesn't work the first time - check your camera and repeat the exercise.
Don't have your ISO on auto. Set the ISO Number (sensitivity) to medium high (400). Move in close to the targets to fill the frame with only the appropriate color for each shot.
Use the camera in Aperture Exposure mode (A or AV). Try using your aperture at the largest opening (smallest number) Focus carefully, hold the camera steady to eliminate any camera movement.
1) With first
white target, let the camera set the proper exposure.
2) With the
black target, let the camera set the proper exposure. It should be different
from the white target.
3) With the
gray target, let the camera set the proper exposure. This should be different
from the Black & White exposures.
you will use "Exposure Value" Compensation
compensation changes exposure making the image either lighter + or darker
4) Move to the White #4 target. Use the EV button to add exposure with +2 and expose frame 4 including the word White and the number 4. Your meter should tell you that you are over exposing.
5) Move to the Black #5 target. Use the EV button to exposure with -2 and expose frame 5including the word Black and the number 5. Your meter should tell you that you are under exposing.
results should look like this:
BRACKETED EXPOSURES EXPOSURE COMPENSATION