Canon EOS 5D Mark IV L-series Zoom Lens Kit オーナーマニュアル

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f
: Aperture-Priority AE
250
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
 
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.298).
 
The exposure will be locked (AE lock) while the depth-of-field preview 
button is being pressed.