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Cameras and exposure meters can take readings of the light levels in a number of ways, from basic to advanced methods. The most basic is Centre-weighted (CW) or average metering that takes a measurement from most of the image area. A more sophisticated version of this is Partial (P) metering that has a narrow area of measurement that is still based on the centre of the image and Spot (S) that can measure from as little as 1 of the image. The most commonly used in more advanced cameras now is Matrix, also known as Multi-pattern (MP) or segment metering, that takes readings from several parts of the scene and produces a calculated average. Buying advice In most cases the basic metering with an auto camera is fine, especially if you have the sun behind you or it is overcast. But when you start to try more advanced shots, such as the sun behind the subject for a backlit halo effect or an archway with light streaming through the pillars or a spotlit subject against a dark background, you may find the standard meter will let you down. If you can see yourself shooting subjects like this, buy a camera that lets you switch over to spot or multi-pattern metering.
A button that's usually found on the right-hand side of the camera that you press to take a picture. Most cameras have a two stage release. The first pressure activates the camera's autofocus and metering modes and the second fires the shutter. Some older cameras have a thread in the centre that you would screw a cable release in to. Some may have a collar around the edge that you turn to lock the shutter to prevent it being fired accidentally.
A display for modes and features in the viewfinder or top-plate of many cameras. Most display the number of photos you have left along with the battery condition and exposure mode. More advanced cameras also have the metering mode, exposure mode and flash mode displayed.