Depth Of Field Preview - Canon EOS 350D Instruction Manual

Aperture Value Display
The higher 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.
Depth of Field Preview N
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The higher the f/number, the darker the viewfinder will look.
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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 you press the depth-of-field
preview button.
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If the "30"" shutter speed blinks, it indicates
underexposure. Turn the <6> dial to set a larger
aperture (lower f/number) until the blinking stops or set
a higher ISO speed.
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If the "4000" shutter speed blinks, it indicates
overexposure. Turn the <6> dial to set a smaller
aperture (higher f/number) until the blinking stops or
set a lower ISO speed.
Press the depth-of-field preview button to
stop down to the current aperture setting.
The diaphragm in the lens will close to the
current aperture and you can check the
depth of field (range of acceptable focus)
through the viewfinder.
f Aperture-Priority AE
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