ExpoImaging ExpoAperture - Manual (Page 38)

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ExpoAperture Depth-of-Field Guides were designed for
general use with 35mm cameras in a broad range of photo-
graphing conditions. With a little manipulation these ranges
can be extended to cover use with all focal length lenses
and all depths-of-field.
5. Advanced Techniques
In order to do this with accuracy, the photographer must use
the procedures outlined for each section on the following
pages.
If your depth-of-field is less than one full zone, then you
must note the aperture required for 1 full zone and mulitply
it by the fraction of the zone required. This is shown in the
following example.
5a. Setting the Aperture for a Distance
Range of Less than One Distance Zone