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[a]
Fig. 4.15a
Fig. 4.15b
~~
~~l~ft
1.5mm
[d) [e]
Fig. 4.15 Slide mounts
72
Montures de diaposltives
Dlariihmchen
3mm
The mount type
Plastic, cardboard and glass mounts are
commonly
used
to frame film. Typically, the plastic and cardboard
mounts center the film in
an
open window. Thus, the
light
passes through the
air
on both sides of the
film
and
through the film. When the
film
is mounted in glass,
there is a thin piece of glass sandwiching the film as
shown in Figure 4.
15
.
Flg.4.15a
Cardboard
or
plastic
slide
mount
[a] Mounted
35
mm
film (air-film-air)
[b] Film
Flg.4.1Sb Glass Slide Mount
[c] Sandwiched
35
mm film (air-glass-film-glass-air)
[d] Film
[e] Glass
In
the case of a glass mount, light must pass through
the air, film and both sides of the glass. This
will
require
manual focus control.
The film location
in
a mount
In
rare cases, the
film
will
not be mounted in the
center
of the mount. Due to the
self
adjusting centering
mechanism mentioned above, focus control
will
be
necessary to accommodate these mount variations.
Emulsion side of the film
The two surfaces of the film
are
not the same. One
side
is called the emulsion
side
. The emulsion side of the
film is shown in Figure 4.2.
In
order
to achieve
maximum focus, the emulsion
side
needs to be face
down when put into the scanner.