74
About
Depth
of
Field
Basics
of
the relationship between focus and depth
of
field are
explained
in
this section .
• Depth of field
When focusing, depth
of
field should be considered. Depth of field is the
zone
of
sharpest focus
in
front
of
and behind the subject on which the
lens is focused. It varies according to shooting distance, focal length and,
above
all
, aperture. Smaller apertures (larger f-numbers) will produce a
deeper depth
of
field where the background and foreground become
sharper; larger apertures (smaller f-numbers) will produce a shallower
depth
of
field where the background becomes blurred. Similarly, shorter
shooting distance or longer focal length will produce a shallower depth
of
field, and longer shooting distance
or
shorter focal length will produce a
deeper depth
of
field. Note that depth of field tends to be shallower
in
front
of
and deeper behind the subject
in
focus.
Small aperture
f/22
Large aperture f/2.8
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