Canon EOS R6 Mark II Mirrorless Camera with 24-105mm f/4-7.1 Lens - Manual (Page 151)

Caution
Do not point the camera toward an intense light source, such as the sun or an
intense artificial light source. Doing so may damage the image sensor or the
camera's internal components.
Long bulb exposures produce more noise in the image than usual.
ISO 400 is used when the camera is set to ISO Auto.
When shooting bulb exposures with the self-timer instead of the bulb timer, keep
pressing the shutter button completely (for the self-timer time and bulb exposure
time).
Note
You can reduce the noise generated during long exposures by using [ : Long
exp. noise reduction ] ( ).
Using a tripod and the bulb timer is recommended for bulb exposures.
You can also shoot bulb exposures with Remote Switch RS-60E3 (sold
separately,
).
You can also shoot bulb exposures with Wireless Remote Control BR-E1 (sold
separately). When you press the remote controller's release (transmit) button, the
bulb exposure will start immediately or 2 sec. later. Press the button again to stop
the bulb exposure.
Bulb Timer
You can set the exposure time for bulb exposures in advance. This feature eliminates the
need to keep holding down the shutter button during bulb exposures, which can reduce
camera shake.
Note that the bulb timer can only be set and will only take effect in <
B > (bulb exposure)
mode.
1.
Select [ : Bulb timer].
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