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Depth of field
Lens aperture controls depth of field
When the lens is accurately
focused on a
subject, there is a certain depth both
in the
foreground and the background, which is also
considered to be in focus. This area is known as
the "depth of field."
The sharp focus area in the foreground
is
usually shallower than the sharp focus area in
the background.
Depth of field has the following
characteris-
tics which should be considered when pictures
are composed:
t , As the lens aperture decreases, the area of
sharp focus
increases. As
lens aperture
increases, the area of sharp focus decreases.
2. As the distance from camera to subject is
increased, so is the area of sharp focus.
3. A telephoto lens has a shallower depth of
field than a wideangle lens.
Full aperture opening
Small aperture opening
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