Samsung EV-NX20ZZBSBUS - Manual (Page 83)

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Shooting Functions >
Metering
Center-weighted
The Center-weighted mode calculates a broader area than the
Spot mode does. It sums up the amount of light in the center portion
of the shot (60 ~ 80 %) and that of the rest of the shot (20 ~ 40 %).
It is recommended for situations where there is a slight difference in
brightness between a subject and a background or an area of the
subject is large compared to the overall composition of the photo.
Spot
The Spot mode calculates the amount of light in the center. When you
capture a photo in conditions where there is a strong backlight behind
a subject, the camera adjusts the exposure so as to shoot a subject
correctly. For example, when you select the Multi mode in a strong
backlight condition, the camera calculates that the overall amount of
light is abundant, which results in a darker photo. The Spot mode can
prevent this situation as it calculates the amount of light in a designated
area.
The subject is in bright color while the background is dark. The Spot
mode is recommended for a situation like this where a huge difference in
the exposure exists between a subject and a background.