A metering mode where the camera measures the light from a very small area of the scene. This might be right in the centre or, on some cameras, it’s directly beneath the selected autofocus point.
This is the most sophisticated form of light metering used by cameras. The light values are measured at many points across the frame and compared to ‘known’ scenes so that the camera can work out what the subject is likely to be and the best way to expose it properly.
This is one of the various light metering patterns offered on most digital cameras. It’s a relatively crude system which averages the light across the whole scene but gives special emphasis to the centre. It’s less reliable for for novices shooting in a wide variety of conditions, but its simple response to scenes actually makes it easier for more experienced photographers to interpret the results.
This is a very simple type of exposure reading where the camera’s light meter just measures the total amount of light in the whole scene. It often leads to underexposure because bright areas in the scene have a disproportionate effect. Today’s digital cameras offer a range of more sophisticated exposure metering patterns and only a few still over averaged metering amongst these – some photographers still like it because although it’s a crude way of measuring the light, it’s quite predictable and easy to interpret.