1. Measuring exposure
Multi-zone or matrix metering
Used to calculate the average brightness of the entire frame. Includes the ability to ignore a small abnormally bright area (such as the sun or reflections of glass), giving correct exposure in most cases.
- Particularly suitable for scenes lit by a single light source such as family portraits or group photos.
Gives a 75% weighting to a broad section in the centre of the image, and a 25% weighting to sections at the edges of the picture.
- Good for classic outdoor shots or scenes with differences in contrast.
Partial or spot metering
Designed to measure a tiny section (typically represented by a small circle in the centre of your camera's viewfinder) covering 1-4% of the frame. The exposure is therefore set based on a small section of the image, leaving you to produce interesting effects with the contrast.
- Useful e.g. for taking a child's face against the light, or a subject lit up against a dark background.