Canon Rebel SL1 EOS 100D Instruction Manual page 9

M: Manual Exposure
In [1_2: Auto Lighting Optimizer[, if the checkmark <_/> for [Disable
during man expo] is removed, the Auto Lighting Optimizer can be set in
the <i> mode (p.130).
When ISO Auto is set, you can press the <')(- > button to Iock the ISO speed.
If you press the <-)(-> button and recompose the shot, you can see the
exposure level difference on the exposure level indicator (p.24, 25)
compared to when the <'X" > button was pressed.
To obtain a correct flash exposure, the flash output will be set
automatically (autoflash exposure) to match the manually-set aperture.
The shutter speed can be set from 1/200 sec. to 30 sec or bulb.
120
A bulb exposure keeps the shutter open for
as long as you hold down the shutter button.
It can be used to shoot fireworks and other
subjects requiring long exposures.
In step 3 on the preceding page, turn the
<_ > dial to the left to set <BULB>.
The elapsed exposure time will be
displayed on the LCD monitor.
During the bulb exposure, do not point the lens toward the sun. The
sun's heat can damage the camera's internal components.
Since bulb exposures produce more noise than usual, the image may
look a little grainy.
When [1_3: Long exp. noise reduction] is set to [Auto] or [Enable],
noise generated by the long exposure can be reduced (p.132).
For bulb exposures, using a tripod and a remote switch (sold separately,
p.310) is recommended.
You can also use a remote controller (sold separately, p.309) for bulb
shooting. When you press the remote controller's transmit button, the
bulb exposure will start immediately or 2 sec. later. Press the button
again to stop the bulb exposure.