Depth of field scale – Canon IV-S2 User Manual
Page 14
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Depth of Field Scale
The Distonce Scale and the Depth of Field Scale are used
together.
Depth of Field means the range of objects which will be in
focus on your film. This range varies with the distance of the
object of sharp focus and the Lens Aperture. It extends from
in front of the object of sharp focus to beyond it. The
greater the Lens Aperture, the less will be the Depth of Field.
Depth of Field also diminishes as the distance of the object
of sharp focus from the film plone decreases.
The illustrotlon shows the Lens Aperture at f:1.8 and the
Distance Scale at 25 feet. An object at 25 ft is in sharp focus.
The Depth of Field Scale shows that the nearest object also
in focus is approximately 21 feet and the farthest object in
focus is approximately 30 feet. If the Lens Aperture Scale is
set at f : 11 the object in focus will extend from 12 feet to
infinity (to). See illustration on next page.