Exposure compensation allows you to correct exposure in semi-automatic modes. In order to avoid prolonging and making certain concepts more complicated, many assume that the exposure meter calculates the exposure based on the average intensity of the cones coming from the whole scene. In reality, it is not exactly like this: there are different ways of measuring exposure that cameras make available to the photographer. Given that not all cameras have the same algorithms and that everyone can be different from model to model, we analyze the most common Editorial Retouching Los Angeles methods.
Partial measurement
In this mode, the exposure meter measures the intensity of the light cones coming only from a narrower central area equal to about 8% of the whole frame. Compared to the center weighted average, this mode does not take into consideration the remaining parts of the scene.
The exposure meter continuously evaluates until the end of the shot.
Spot measurement – spotIn this mode, the exposure meter measures the intensity of the light cones coming only from an even smaller central area equal to about 3% of the whole frame. It is a specific precision mode for a small area in particular. The exposure meter continuously evaluates until the end of the shot.
Evaluative Measurement
This is the most complex Editorial Retouching Los Angeles but often more effective way. The exposure meter divides the frame into zones and performs distinct measurements giving greater weight to the areas closest to the AF point at the time of focusing. It is usually the default mode set. The exposure meter performs the evaluation at the time of focusing (pressing the shutter button halfway) and locks it until the end of the shot.
The only mode that blocks the values at the time of focusing is the evaluation. This consideration is of particular importance because it means that if you want to use one of the other modes, the elements on which you want to measure the exposure must be, at the time of shooting, exactly in the areas of the frame used by the exposure meter. In fact, suppose you want to use the spot mode to photograph the face of a person not very close.
If in the composition of the frame the face is exactly in the middle, in that 3% where the exposure meter makes its assessments, then everything is ok, but if it is in a decentralized position, as the exposure meter continues to evaluate only that small area up at the end of the shot, the exposure will not be calculated on the face of our subject but on something that is exactly in the center of the frame.
Leave a Reply