Lesson 3/Learning Event 12
Figure 3-13.
Depth of field scale
b. When this lens is focused at 13 feet, depth of field at f/8 ranges
from about 7 to 22 feet. If used at f/16 depth of field would range from
about 6 to 35 feet.
4.
To use a depth of field scale:
a. Set the correct focusing distance for the subject by turning the
focusing ring until the subject appears sharp in the viewfinder.
b. Set the aperture, make sure you set a usable shutter speed for
correct exposure with the selected aperture.
c. Look at the depth of field scale and find the marks on it that
correspond to the aperture you have set. On the depth of field scale there
are two numbers for each corresponding lens aperture, one on either side of
the scale center line.
d. As there are two corresponding numbers on the depth of field scale
for the aperture you have set, read the two distances on the focusing ring
which are opposite the two numbers on the depth of field scale. The subject
will be in focus between these two points. Since exact measurements may not
appear opposite the aperture numbers, you may have to estimate the
distances.
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