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Depth-of-Field Scale
The depth-of-field scale indicates the distances from the
camera in which the photograph's subjects will be in
sharp focus on the film. For example, if the lens used is a
50mm lens and the subject has been focused at a distance
of 3m (10'), with an f/8 value, read off from the scale on
either side of the indicator (orange line). The depth-
of-field is from approximately 2.3m (8') to 4.3m (14').
If the aperture is closed down to f/16, the picture will
become sharp between 1.9m (6') to 7.6m (25') from the
camera. Basically, the smaller the f/stop, the greater the
distance of the subject from the camera; or, the shorter
the lens focal length, the deeper will be the depth-
of-field. On the other hand, the larger the f/stop, the
nearer the subject to the camera; or, the longer the lens
focal length, the shallower will be the depth-of-field.
In the case of Canon FD lenses, you can see the actual
sharpness through the viewfinder by pressing the
stopped-down lever.
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50mm Lens f/8
Depth-of-field 2.3-4.3m (8’-14’)
Focused at 3m (10’)
50mm Lens f/16
Depth-of-field 1.9-7.6m (6’-25’)
Focused at 3m (10’)