Canon AE-1 - Manual (Page 76)

shutter speed dial until the meter needle on
the right of the viewfinder reaches the f/stop
desired.
Depth-of-Field
When a certain subject is brought into
focus, there is only a limited range in the
foreground and background of the subject
which can be kept clearly in focus. This zone
of sharpness in the subject field is depth-of-
field.
There are two methods of confirming the
extent of the depth of the field: by stopping
down the lens diaphragm or by reading a value
from the depth-of-field scale on the lens.
^ Confirming the Depth-of-Field by
I Stopping-Down the Lens Diaphragm
1. Wind the film and determine the aperture
required for the subject by metering, then set
the f/stop by turning the aperture ring after
disengaging the aperture ring from the "A"
mark.
2. Press the stopped-down lever until it
locks. Once locked, the depth-of-field can be
checked by looking into the viewfinder. Thus,
the extent of the depth-of-field can be seen
as the zone of sharpness in the subject field