Evaluative metering
Light measurements are obtained from a number of various places or zones throughout the image in this type of metering system, which is used on many different types of cameras. Following this, the readings are compared to the information that has been pre-programmed into the camera so that it can determine an optimum exposure setting. In order to determine the most likely location of the subject, information obtained from the multipoint autofocus system is also considered. This so-called "intelligent" metering system has the potential to circumvent many of the problems that plague more straightforward methods. On the other hand, since it is hard to make a second estimate, it can be challenging to anticipate the instances in which it will get the exposure wrong. Matrix metering is another name for this technique.
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