Canon EOS 20D 取り扱いマニュアル

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f Aperture-Priority AE
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If the “30"” shutter speed blinks, it indicates 
underexposure. Turn the <
6> dial to set a larger 
aperture (smaller f/number) until the blinking stops or 
set a higher ISO speed.
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If the “8000” shutter speed blinks, it indicates 
overexposure. Turn the <
6> dial to set a smaller 
aperture (larger f/number) until the blinking stops or set 
a lower ISO speed.
Aperture Value Display
The larger the f/number, the smaller the aperture opening will be. The 
aperture values displayed will differ depending on the lens. If no lens is 
attached to the camera, “00” will be displayed for the aperture value.
Press the depth-of-field preview button to 
stop down to the current aperture setting. 
The diaphragm in the lens will be set to 
the current aperture so you can check the 
depth of field (range of acceptable focus) 
through the viewfinder.
Depth of Field Preview
N
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In the <
8> mode, press the shutter button halfway to focus, then 
press the depth-of-field preview button while still pressing the shutter 
button halfway.
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The exposure is locked (AE lock) while the Depth-of-Field Preview button 
is pressed.