Center Weighted Metering
The first automatic exposure cameras used center weighted metering because we hadn't developed more advanced computer programs to calculate light levels.
Center weighted metering would be effective when you have a bright background or backlit subject. For example, if you were taking a photograph of a persons face on a sunny day at the beach.
Canon digital cameras use a center weighted metering system, which means that the camera measure the exposure from a small area in the center of the image.
It's best to use center weighted metering with the Canon bellows. The Icon for center weighted metering is the hollow circle with no spot in the center.
When working in light this dim select CENTER WEIGHTED metering and be careful what you choose to meter. Don't use spot, since the spot meter's range does not extend into this dark range.
When making an auto exposure the camera is programmed to look at a number of spots in the scene, and if the camera was designed to use center weighted metering, most of those spots will be in the center area of the picture.
For example, with the F5, the exposure metering range s from EV0 to EV20 for 3D Color Matrix Metering and Center Weighted Metering, at ISO 100 with an f/1.
Center weighted metering down to EV 6. Then it switches to averaging plus the finder internally illuminates so you can see the shutter speed, exposure compensation (2 stops) and distance (ikons) in the finder window. Its a lot of fun! ...
It is known as subtractive color system because the required color is produced by subtracting different quantities of cyan, magenta and yellow from white.
CW
Center weighted metering system that assigns most importance to the central part of the ...
 See also: Meter, Metering, Center weighted, Camera, Exposure
  
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