Canon Rebel SL1 EOS 100D Instruction Manual page 7

AV: Changing the Depth of Field
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To obtain a correct flash exposure, the flash output will be set
automatically to match the set aperture (autoflash exposure). The
shutter speed will be set automatically between 1/200 sec. - 30 sec. to
suit the scene's brightness.
In low light, the main subject is exposed with the auto flash metering,
and the background is exposed with a slow shutter speed set
automatically. Both the subject and background look properly exposed
(automatic slow-speed flash sync). If you are handholding the camera,
keep it steady to prevent camera shake. Using a tripod is
recommended.
To prevent a slow shutter speed, under [1_12: Flash control], set
[Flash sync. speed in Av mode] to [1/200-1/60 sec. auto] or [1/200
sec. (fixed)] (p.232).
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).
_] While looking at the Live View image (p.150) and holding down the depth-of-
field preview button, you can change the aperture and see how the depth of
field changes.
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