Canon EOS 80D - Manual (Page 163)

161
f : Aperture-Priority AE
The aperture opening (diaphragm) changes only at the moment when
the picture is taken. Otherwise, the aperture remains fully open.
Therefore, when you look at the scene through the viewfinder or on the
LCD monitor, the depth of field will look narrow.
Press the depth-of-field preview button
to stop down the lens to the current
aperture setting, and check the depth of
field (range of acceptable focus).
Depth-of-Field PreviewN
 If the “30"” shutter speed blinks, it indicates
underexposure.
Turn the <6> dial to set a faster aperture
(lower f/number) until the shutter speed blinking stops or
set a higher ISO speed.
 If the “8000” shutter speed blinks, it indicates
overexposure.
Turn the <6> dial to set a slower aperture (higher
f/number) until the shutter speed blinking stops or set a
lower ISO speed.
Aperture Value Display
The higher the f/number, the smaller the aperture opening will be. The
f/number displayed will differ depending on the lens. If no lens is attached to
the camera, “00” will be displayed for the aperture.
 A higher f/number will make more of the foreground and background fall
within acceptable focus. However, the viewfinder will look darker.
 The depth-of-field effect can be clearly seen on the Live View image as
you change the aperture and press the depth-of-field preview button
(p.174).
 The exposure will be locked (AE lock) while the depth-of-field preview
button is being pressed.