Samsung EV-NXF1ZZB1QUS - Manual (Page 21)

20
Concepts in Photography
Correlation between focal length, angle,
and perspective
Focal length, which is measured in millimeters, is the distance between
the middle of the lens to its focal point. 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.
9 mm angle 27 mm angle
Depth of field
Portraits or still-life photos mostly acclaimed by people are the ones on
which the background is out of focus so the subject looks pronounced.
Depending on the focused areas, a photo can be blurred or sharpened.
This is called 'a low DOF' or 'a high DOF'.
The depth of field is the focused area around the subject. Therefore, 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, which stresses the subject and makes the rest
of it blurred, can be obtained by capturing a photo close to the subject or
selecting a low aperture value. Conversely, a photo with a large DOF which
shows all the elements on the photo sharply focused can be achieved by
capturing a photo far from the subject or selecting a high aperture value.
Small Depth of Field Large Depth of Field