Checking The Depth Of Field - Canon AE-1 PROGRAM Instructions Manual

18. Checking the Depth of Field
There are two ways to check the depth of field.
The usual one is by using the depth-of-field
scale on the lens. This is a scale of f/stops re-
peated on each side of the distance index.
1. First focus. Then press the shutter button
halfway and note which number appears in
the viewfinder. Find the two f l stops on the
depth-of-field scale which correspond to
that number.
2. Draw imaginary lines from those two num-
bers to the distance scale. The effective
depth of field lies between those two dis-
tances.
51
You can roughly check the depth of field visually
with an FD lens as follows :
1. Make sure the film has been completely
advanced.
2. Press the shutter button halfway to find out
which number is displayed in the viewfinder.
3. Then press in the AE lock pin and turn the
aperture ring to that number.
Note
As a reminder that the lens is off "A," the "M" will
light up in the viewfinder when you press the shut-
ter button halfway.