ExpoImaging ExpoDisc Instructions for Film Cameras - Manual (Page 5)

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practiced not as any form of visualization at all, but rather as preparation for
visualization or as a verbal substitute for it.
As we learned it, previsualization consisted of:
1. First planning the amount of exposure and developing time to be used with
each sheet of film, and
2. Then applying Ansel Adam’s Zone System to each subject’s brightness range
to create a set of mini-ranges or “zones,” for linkage with similarly organized
exposure levels and image tones.
With color slide films, previsualization and tone control can be both easy and
uniquely effective.
For the most life-like rendering of everything in the same lighting as the
ExpoDisc when exposure settings were determined, simply provide for “normal”
exposure.
For lighter, airier and more pastel-like images, and shorter tonal range, provide
up to one stop more exposure.
For darker, heavier, more three-dimensional images, and greater tonal range,
provide up to one stop less exposure.
Then, if you want to go further, leave the settings as they will be for making the
exposure, remove the Expo-Disc from in front of the lens, point the camera in
any direction and turn on the meter.
If the meter reading changes by less than half a stop, then the brightness of the
area the camera “sees” lies in the Zone V range and will be rendered in a Zone V
image tone.
If the meter shows a 1, 2, 3, or 4-stop increase in brightness, the brightness lies in
the Zone VI, VII, VIII, OR IX range, and will be rendered in a corresponding
image tone.
If the meter shows a 1, 2, 3, or 4-stop decrease in brightness, the brightness lies in
the Zone IV, III, II, or I range, and will be rendered in a corresponding image
tone.
The precise color slide density or tone that you might prefer to identify with the
Zone V range of image tones can be a matter of taste but once chosen, it should
be constant regardless of the film employed.
The image tones associated with all other zones will depend upon the film
involved, but these will be constant for any given type of film – and all can be
previsualized.
This previsualization can be done either from familiarity with the film involved,
or from a study of its characteristics as portrayed by a graph similar to the one in
the preceding pages.