Samsung NX100 - Page 25

How the aperture setting, shutter
speed, and ISO sensitivity control
exposure
A change in shutter speed, aperture value, or ISO
sensitivity can be offset by adjustments to the others
to maintain the amount of light. The results, however,
change according the settings. For example, shutter
speed is useful in expressing movement, aperture
can control the depth of field, and ISO sensitivity can
control the graininess of a photo.
Correlation between focal length,
angle, and perspective
Focal length, which is measured in millimeters, is the
distance between the lens and the image sensor. It
affects the angle and perspective of captured images.
A short focal length translates into a wide angle, which
allows you to capture a wide shot. A long focal length
translates into a narrow angle, which allows you to
capture telephoto shots.
Depth of field
The depth of field is the focused area around the
subject. Depending on the focused areas, a photo can
be blurred or sharpened. A small DOF signifies that the
focused area is narrow, and a large DOF means the
focused area is wide.
A photo with a small DOF stresses the subject and
makes the rest of it blurred. Conversely, a photo with
a large DOF shows all the elements on the photo
sharply focused.
Composition
Composition in photography means arranging objects
in a photo. Usually, abiding by the rule of thirds leads
to a good composition.
Rule of thirds
To use the rule of thirds, divide the image into a 3x3
pattern of equal rectangles. To compose photos that
best emphasize the subject, make sure the subject is
located at one of the corners of the center rectangle.
Press [Shutter] to take the photo.
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