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!I.J
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.
Large aperture f/
2.B
Small aperture f/32
• {) I' M
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