Depth of field – Nikon AI-S Micro-NIKKOR 105mm f-2.8 User Manual
Page 16
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until the image appears sharp on the focusing screen.
• The tightening screw is indexed “4” for one-fourth.
Depth of field
Depth of field refers to the zone of acceptable focus
in front of and behind the area of sharpest focus in
your
shot.
At
high
reproduction
ratios,
depth
of
field
is
extremely
shallow;
it’s
best,
therefore,
to
preview before actual shooting. One way to do this is
to
press
the
depth-of-field
button
on
your
camera
and
the
lens
will
close
to
the
preselected
aperture,
showing
you
how
much
background
and
foreground
is in focus. Another way is to read the color-coded
indicators
inscribed
on
the
lens
barrel.
The
pairs
of
colored lines on either side of the distance index line
correspond
to
the
f/numbers
of
the
same
color
on
the
aperture
scale.
At
close
distances,
however,
so
little is in focus that it may be more useful to check
the depth-of-field tables on pages 32 and 33.