The
Gallery of Double Exposure:
In
film and photography,
double exposure is a technique
in which a piece of film
is exposed twice, to
two
different images. The
resulting photographic
image shows
the second image superimposed
over the first. The technique
can be used to create
ghostly images or to add
people
and objects to a scene
that were not originally
there. It is frequently
used in photographic
hoaxes. It also is sometimes
used
as an artistic visual
effect, especially when
filming
singers or musicians.
It is considered easiest
to have a manual winding
camera for double exposures.
On automatic winding
cameras, as soon
as a picture is
taken the film is typically
wound
to the next frame. Some
more advanced automatic
winding
cameras have the option
for multiple exposures
but it
must be set before making
each exposure. Manual
winding cameras with
a multiple
exposure feature can
be set to double-expose
after making the first
exposure.
Since shooting multiple
exposures will expose
the same frame
multiple times, negative
exposure compensation
must first be set to
avoid overexposure.
For example, to expose
the frame twice with
correct
exposure, a -1 EV compensation
have to be done, and
-2 EV
for exposing four times.
This may not be necessary
when photographing a
lit subject in two
(or more)
different positions against
a perfectly dark background,
as the background area
will be essentially unexposed.
Medium to low light is
ideal for double exposures.
A tripod
may not be necessary
if combining different
scenes
in one shot.
In some conditions, for
example, recording the
whole progress
of a lunar eclipse in
multiple exposures, a
stable tripod
is essential.
More than two exposures
can be combined, with
care not
to overexpose the film.
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