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70
4-4 Focus
There may be
times
when it is
necessary
to
adjust
the
focus control in
order
to
achieve
maximum
scanning
performance. Focus control becomes
more
si
gnificant
when a high resolution scan is taken. High resolution
typically
ranges from Pitch=1 to Pitch=2 scans.
Focus is affected by the position of the
film
with respect
to the optics in the scanner. The most common
parameter
that can cause focus
problems
is the
thickness of the
film
mount. Fortunately, the
scanner
utilizes
a self-adjusting focus
mechanism
. This
mechanism
automatically
centers
the
film
in the
center
of the focal region
regardless
of the thickness of the
slide
mount.
It should be noted that the focus control of the
scanner
cannot be used to
sharpen
unfocused
film
. These
are
some
software
processing
techniques that can be used
to help
sharpen
unfocused
film
.
The
following
is a
list
of
things
that can affect focus.
Thickness
of
the slide mount
There is a
wide
variety
of
slide
mounts
popularly
used
today. The thickness of these mounts affects
where
the
film
will
be positioned within the
slide
mount
and
consequently
within
the
scanner
. This
scanner
utilizes a
self-
adjusting
focus
mechanism
. This mechanism
automatically
centers the
film
in the
center
of the focal
region
regardless
of the thickness of the slide mount.
The film type
Many
film
types
are
used today. The
film
material,
film
thickness, dyes and
emulsions
used on the
film
can
affect
how
light
passes
through
the
film
and
consequently affects the focus.