When you focus on a specific subject, a distance in front of and behind the subject will appear acceptably sharp in your pic ture. This area is called the "DEPTH OF FIELD".
The depth of field can be determined in the following ways:
1. Each lens has a depth of field scale. For ex ample with a distance of 3m/9.8 ft and using f/16, the area within the
two f/16 marks on the scale (about 2m/6.6 ft - 8m/26.3 ft) will be in sharp focus. (Fig. 42)
DEPTH OF FIELD