Exposure control - Spot metering

To begin with, half-press the shutter release button to turn on LED in the viewfinder.

Seeing through the viewfinder, locate the subject in the spot metering circle.
Then, press the "SPOT" button on the camera top.
As shown in the right figure, "SPOT" and a dot can be seen in the viewfinder.
Adjust aperture or shutter speed to set the dot at the correct exposure index.