Canon EOS Rebel T5 18-55 IS II Kit - Manual (Page 110)

a: Manual Exposure
110
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.
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
<6> dial to the left to set <BULB>.
The elapsed exposure time will be
displayed on the LCD monitor.
D Using the Built-in Flash
BULB: Bulb Exposures
Elapsed exposure time
During the bulb exposure, do not point the camera toward an intense
light source, such as the sun on a sunny day or an intense artificial light
source. Doing so may damage the image sensor or the camera’s internal
components.
Since bulb exposures produce more noise than usual, the image may
look slightly grainy.
You can reduce the noise due to long exposures by setting [4: Long exp.
noise reduction] under [53: Custom Functions (C.Fn)] to [1: Auto] or
[2: On] (p.260).
If ISO Auto is set for a bulb exposure, the ISO speed will be fixed at ISO
800 (p.90).
For bulb exposures, using a tripod and a remote switch (sold separately,
p.269) is recommended.
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