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MORE ADVANCED GUIDES
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 character¬
istics which should be considered when pictures
are composed:
1. As the lens aperture decreases, the area of
sharp focus increases. As lens aperture in¬
creases, 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
25
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