Canon EOS 250D Advanced User's Manual page 157

Using the Built-in Flash
To obtain a correct flash exposure on the main subject, the flash output will
be set automatically (autoflash) to match the manually-set aperture. Note
that the range of settable shutter speed will be limited within 1/200 sec. to
30 sec. or to bulb.
BULB: Long (Bulb) Exposures
Do not point the camera toward an intense light source, such as the sun or an
z
intense artificial light source. Doing so may damage the image sensor or the
camera's internal components.
Since long bulb exposures produce more noise than usual, the image may
z
look slightly grainy.
If ISO Auto is set, the ISO speed will be ISO 400.
z
When shooting bulb exposures, if you use both the self-timer and mirror
z
lockup, keep pressing the shutter button completely (for self-timer delay time
+ bulb exposure time). If you let go of the shutter button during the self-timer
countdown, there will be a shutter-release sound, but no picture will be taken.
You can reduce the noise due to long exposures by setting [z: Long exp.
z
noise reduction] to [Auto] or [Enable] (= 139).
For bulb exposures, using a tripod and a remote switch (sold separately,
z
= 463) is recommended.
You can also use Wireless Remote Control BR-E1 (sold separately, = 463)
z
for bulb exposures. When you press the BR-E1's release button (transmit
button), the bulb exposure will start immediately or 2 sec. later. Press the
button again to stop the bulb exposure.
You can turn off the elapsed exposure time display by pressing the <B>
z
button.
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 page 155, turn the <6>
dial to the left to set <BULB>. The elapsed
exposure time (1) will be displayed on the
(1)
LCD monitor.
157