ExpoImaging Medium Format Film - Manual (Page 2)

Example 2: Determine the depth of field obtained when using a specific focal
length and aperture setting using a 120mm focal length lens, f22 aperture,
and focal point (subject) distance of 10 feet.
2.a On the front of the Depth of Field Guide
set the dial to the actual focal length of
your lens.
120mm
2.b Read the number of zones on the dial
below the f-stop you want to use.
Using an aperture of f22
The number of zones is 1
2.c Multiply the number of zones by two (2).
The number of zones is now 2
2.d On the Zone Dial (the back of the Depth
of Field Guide) determine the distance to
the focal point (subject).
10 feet
2.e Center the number of zones determined
in step 2.c on your focal point and read
the depth of field.
Using 2 focus zones at 10 feet
The depth of field is…
7½ to 15 feet
Copyright 2005 Expoimaging, Inc. All Rights Reserved