Canon EOS 50E - Manual (Page 60)

IV. Creative Zone Modes
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A blinking aperture setting indicates that the desired depth of field cannot be
attained. Use a wide-angle lens or move away from the subject and repeat
steps 3 to 5.
If the 30” shutter speed and the maximum aperture setting (smallest f-number)
blink, the scene is too dark and the picture cannot be taken in the depth-of-field
AE mode.
If the 4000 shutter speed and the minimum aperture setting (largest f-number)
blink, the scene is too bright. Attach a neutral density filter (sold separately) on
the lens to reduce the amount of light received by the camera.
When using a zoom lens, do not zoom before taking the picture in the depth-of-
field AE mode.
After setting one or two dEP points, do not use the Main Dial to change the
focusing poinf Doing so will cancel the dEP point(s) that has been set.
Depth-of-field AE cannot be used if the focus mode switch on the lens has
been set to M The Program AE mode will be set automatically instead,
Depth-of-field AE cannot be used with flash. If flash is used, the result will be
the same as using Program AE with flash.
If depth-of-field AE is used with a lens having a focusing distance range switch
(for example, EF 300mm f/2 8 lens), set the switch to the maximum focusing
distance range.
If a slow shutfer speed has been set, use a tripod to prevent a blurred shot.
To cancel depth-of-field AE midway, set the Command Dial to another mode
To further increase the depth of field, use a wide-angle lens.
Setting dEP points 1 and 2 at the same point on the subject will make the
depth of field shallow. The foreground and background will then be blurred,
making the subject stand out. Using a telephoto lens increases this effect.
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