ExpoImaging ExpoDisc Instructions for Film Cameras - Manual (Page 3)

3
Follow the procedure described for photographing front-lit subjects, but just
before clicking the shutter, reduce the exposure one full stop, to provide for
appropriately darker-than-normal image tones in the shadow areas.
4. Pre-Exposing or “Flashing ” film
Note. Your camera must first be able to do a double exposure on a frame to
“flash” the film as it’s described in the following section.
Photographers sometimes pre-expose or “flash” film before using it in order to
reduce overall contrast or to modify color in the darkest image areas – without
altering the mid-range and lighter image tones. This is particularly useful when
working with color slide films.
1.Mount your ExpoDisc in front of your camera lens and point it in any direction,
depending upon the color of “flashing” desired.
2.Adjust the exposure settings to provide for “normal” exposure, and then
increase the aperture number or shutter speed setting by four full stops.
3. With the ExpoDisc still in front of the lens, trip and re-cock the shutter without
advancing the film.
Note: When they can anticipate the color of flashing they will be wanting, some
photographers pre-expose entire rolls of film in advance.
5. Testing Films and Processing
There isn’t much any photographer can do about controlling image tones unless
he has a pretty good idea of just how his film (and processing) will render
different exposure levels. The procedure described below puts this information
within every photographer’s grasp.
1. Set your 35mm SLR camera’s ASA indicator to match the ASA rating of the
film in the camera and set the aperture at f/16.
2. Point the camera and ExpoDisc towards any light source and set the shutter
speed at any setting that causes the camera meter to indicate good exposure
conditions.
3. Make a series of five exposures using f/16, f/11, f/8, f/5.6, and f/4 aperture
settings, and label them V, VI, VII, VIII, and IX, respectively.
4. Leave the shutter speed unchanged, set the aperture at f/4, and point the
camera and ExpoDisc in a different direction, even move to a different location if
necessary so that the camera meter again indicates good exposure conditions.
5. Make a second set of five exposures using f/16, f/11, f/8, f/5.6, and f/4
aperture settings, and label these I, II, III, IV, and V, respectively.
6. Process the film or have it processed, determine the film densities associated
with each exposure level or “zone,” and plot the exposure/density relationships
as shown in the graph on the following page.
*Make a note of the shutter speed employed. Light intensities requiring very long
or short exposure times may provide different results.